Update r1.9 release notes.
Update r1.9 release notes.

- link to new get_started.
- Add keras CuDNN layers.
- Links for gradient boosted estimators.
- Added new contrib-estimators and string-processing.
- Bumped some minor sounding things down from "Major" to "Bugfix+Other"
kevin-coder/tensorflow-fork,apark263/tensorflow,renyi533/tensorflow,theflofly/tensorflow,Intel-tensorflow/tensorflow,xodus7/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,cxxgtxy/tensorflow,aselle/tensorflow,jendap/tensorflow,renyi533/tensorflow,asimshankar/tensorflow,frreiss/tensorflow-fred,caisq/tensorflow,karllessard/tensorflow,jbedorf/tensorflow,hehongliang/tensorflow,hehongliang/tensorflow,Bismarrck/tensorflow,petewarden/tensorflow,paolodedios/tensorflow,arborh/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,kevin-coder/tensorflow-fork,freedomtan/tensorflow,frreiss/tensorflow-fred,jart/tensorflow,Intel-Corporation/tensorflow,caisq/tensorflow,alsrgv/tensorflow,gunan/tensorflow,DavidNorman/tensorflow,Intel-Corporation/tensorflow,meteorcloudy/tensorflow,ZhangXinNan/tensorflow,asimshankar/tensorflow,ghchinoy/tensorflow,girving/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,kevin-coder/tensorflow-fork,gautam1858/tensorflow,girving/tensorflow,davidzchen/tensorflow,meteorcloudy/tensorflow,seanli9jan/tensorflow,hfp/tensorflow-xsmm,Intel-tensorflow/tensorflow,jendap/tensorflow,alshedivat/tensorflow,AnishShah/tensorflow,adit-chandra/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jart/tensorflow,caisq/tensorflow,adit-chandra/tensorflow,brchiu/tensorflow,apark263/tensorflow,chemelnucfin/tensorflow,yongtang/tensorflow,theflofly/tensorflow,xzturn/tensorflow,Bismarrck/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,jendap/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,theflofly/tensorflow,jhseu/tensorflow,jalexvig/tensorflow,asimshankar/tensorflow,hehongliang/tensorflow,cxxgtxy/tensorflow,apark263/tensorflow,kobejean/tensorflow,gunan/tensorflow,gautam1858/tensorflow,DavidNorman/tensorflow,chemelnucfin/tensorflow,seanli9jan/tensorflow,arborh/tensorflow,ZhangXinNan/tensorflow,DavidNorman/tensorflow,jart/tensorflow,alshedivat/tensorflow,dongjoon-hyun/tensorflow,freedomtan/tensorflow,ZhangXinNan/tensorflow,tensorflow/tensorflow,hfp/tensorflow-xsmm,jalexvig/tensorflow,karllessard/tensorflow,meteorcloudy/tensorflow,Bismarrck/tensorflow,snnn/tensorflow,xodus7/tensorflow,apark263/tensorflow,snnn/tensorflow,ageron/tensorflow,xzturn/tensorflow,drpngx/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,annarev/tensorflow,brchiu/tensorflow,jendap/tensorflow,gunan/tensorflow,kevin-coder/tensorflow-fork,Intel-tensorflow/tensorflow,jhseu/tensorflow,kevin-coder/tensorflow-fork,ZhangXinNan/tensorflow,aselle/tensorflow,yongtang/tensorflow,xzturn/tensorflow,paolodedios/tensorflow,xzturn/tensorflow,adit-chandra/tensorflow,xzturn/tensorflow,alsrgv/tensorflow,davidzchen/tensorflow,dancingdan/tensorflow,freedomtan/tensorflow,caisq/tensorflow,apark263/tensorflow,aselle/tensorflow,dancingdan/tensorflow,theflofly/tensorflow,davidzchen/tensorflow,kobejean/tensorflow,jhseu/tensorflow,renyi533/tensorflow,jhseu/tensorflow,paolodedios/tensorflow,adit-chandra/tensorflow,ageron/tensorflow,jhseu/tensorflow,alshedivat/tensorflow,jbedorf/tensorflow,annarev/tensorflow,renyi533/tensorflow,DavidNorman/tensorflow,jalexvig/tensorflow,frreiss/tensorflow-fred,arborh/tensorflow,Bismarrck/tensorflow,dongjoon-hyun/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,seanli9jan/tensorflow,davidzchen/tensorflow,Intel-tensorflow/tensorflow,ghchinoy/tensorflow,arborh/tensorflow,chemelnucfin/tensorflow,frreiss/tensorflow-fred,alsrgv/tensorflow,arborh/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,freedomtan/tensorflow,dancingdan/tensorflow,karllessard/tensorflow,aldian/tensorflow,aam-at/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,jalexvig/tensorflow,davidzchen/tensorflow,jalexvig/tensorflow,yongtang/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,alshedivat/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,arborh/tensorflow,meteorcloudy/tensorflow,ageron/tensorflow,renyi533/tensorflow,theflofly/tensorflow,ghchinoy/tensorflow,chemelnucfin/tensorflow,yongtang/tensorflow,dancingdan/tensorflow,ppwwyyxx/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,theflofly/tensorflow,jhseu/tensorflow,alsrgv/tensorflow,gautam1858/tensorflow,brchiu/tensorflow,adit-chandra/tensorflow,caisq/tensorflow,gunan/tensorflow,ghchinoy/tensorflow,paolodedios/tensorflow,girving/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jendap/tensorflow,ageron/tensorflow,alsrgv/tensorflow,alsrgv/tensorflow,aselle/tensorflow,theflofly/tensorflow,Bismarrck/tensorflow,adit-chandra/tensorflow,ghchinoy/tensorflow,jbedorf/tensorflow,aselle/tensorflow,dongjoon-hyun/tensorflow,ghchinoy/tensorflow,dancingdan/tensorflow,brchiu/tensorflow,jhseu/tensorflow,davidzchen/tensorflow,theflofly/tensorflow,aldian/tensorflow,asimshankar/tensorflow,AnishShah/tensorflow,xodus7/tensorflow,dongjoon-hyun/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jhseu/tensorflow,manipopopo/tensorflow,DavidNorman/tensorflow,drpngx/tensorflow,Intel-tensorflow/tensorflow,AnishShah/tensorflow,asimshankar/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,dongjoon-hyun/tensorflow,renyi533/tensorflow,renyi533/tensorflow,paolodedios/tensorflow,jbedorf/tensorflow,aldian/tensorflow,freedomtan/tensorflow,kevin-coder/tensorflow-fork,snnn/tensorflow,aselle/tensorflow,asimshankar/tensorflow,tensorflow/tensorflow,arborh/tensorflow,drpngx/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,seanli9jan/tensorflow,gunan/tensorflow,jhseu/tensorflow,jart/tensorflow,karllessard/tensorflow,gunan/tensorflow,ghchinoy/tensorflow,snnn/tensorflow,hehongliang/tensorflow,alshedivat/tensorflow,jendap/tensorflow,dancingdan/tensorflow,hfp/tensorflow-xsmm,freedomtan/tensorflow,kobejean/tensorflow,xodus7/tensorflow,davidzchen/tensorflow,aselle/tensorflow,dongjoon-hyun/tensorflow,xzturn/tensorflow,ppwwyyxx/tensorflow,ageron/tensorflow,snnn/tensorflow,Intel-Corporation/tensorflow,asimshankar/tensorflow,ppwwyyxx/tensorflow,ppwwyyxx/tensorflow,davidzchen/tensorflow,jendap/tensorflow,kevin-coder/tensorflow-fork,drpngx/tensorflow,aam-at/tensorflow,AnishShah/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,AnishShah/tensorflow,chemelnucfin/tensorflow,snnn/tensorflow,sarvex/tensorflow,manipopopo/tensorflow,jbedorf/tensorflow,petewarden/tensorflow,gunan/tensorflow,aldian/tensorflow,jbedorf/tensorflow,DavidNorman/tensorflow,gautam1858/tensorflow,apark263/tensorflow,hfp/tensorflow-xsmm,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,Bismarrck/tensorflow,petewarden/tensorflow,chemelnucfin/tensorflow,petewarden/tensorflow,xodus7/tensorflow,tensorflow/tensorflow,kobejean/tensorflow,dancingdan/tensorflow,frreiss/tensorflow-fred,brchiu/tensorflow,brchiu/tensorflow,AnishShah/tensorflow,theflofly/tensorflow,renyi533/tensorflow,seanli9jan/tensorflow,ghchinoy/tensorflow,jendap/tensorflow,renyi533/tensorflow,xodus7/tensorflow,brchiu/tensorflow,girving/tensorflow,karllessard/tensorflow,xzturn/tensorflow,chemelnucfin/tensorflow,dongjoon-hyun/tensorflow,hfp/tensorflow-xsmm,caisq/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gunan/tensorflow,xodus7/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,seanli9jan/tensorflow,cxxgtxy/tensorflow,Bismarrck/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ZhangXinNan/tensorflow,aam-at/tensorflow,xodus7/tensorflow,meteorcloudy/tensorflow,seanli9jan/tensorflow,gautam1858/tensorflow,kobejean/tensorflow,hehongliang/tensorflow,asimshankar/tensorflow,gunan/tensorflow,ageron/tensorflow,aldian/tensorflow,girving/tensorflow,aselle/tensorflow,hfp/tensorflow-xsmm,manipopopo/tensorflow,chemelnucfin/tensorflow,dancingdan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,manipopopo/tensorflow,seanli9jan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,DavidNorman/tensorflow,tensorflow/tensorflow-pywrap_saved_model,asimshankar/tensorflow,hfp/tensorflow-xsmm,adit-chandra/tensorflow,cxxgtxy/tensorflow,alshedivat/tensorflow,alshedivat/tensorflow,alsrgv/tensorflow,frreiss/tensorflow-fred,manipopopo/tensorflow,annarev/tensorflow,davidzchen/tensorflow,ageron/tensorflow,kobejean/tensorflow,jhseu/tensorflow,meteorcloudy/tensorflow,tensorflow/tensorflow,dongjoon-hyun/tensorflow,jendap/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,hfp/tensorflow-xsmm,brchiu/tensorflow,AnishShah/tensorflow,asimshankar/tensorflow,jart/tensorflow,drpngx/tensorflow,ppwwyyxx/tensorflow,chemelnucfin/tensorflow,kobejean/tensorflow,girving/tensorflow,aam-at/tensorflow,meteorcloudy/tensorflow,manipopopo/tensorflow,kobejean/tensorflow,caisq/tensorflow,aam-at/tensorflow,jart/tensorflow,frreiss/tensorflow-fred,arborh/tensorflow,ppwwyyxx/tensorflow,alshedivat/tensorflow,aselle/tensorflow,Bismarrck/tensorflow,DavidNorman/tensorflow,Bismarrck/tensorflow,karllessard/tensorflow,gunan/tensorflow,apark263/tensorflow,meteorcloudy/tensorflow,theflofly/tensorflow,sarvex/tensorflow,ghchinoy/tensorflow,sarvex/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,Intel-Corporation/tensorflow,aselle/tensorflow,jart/tensorflow,jendap/tensorflow,apark263/tensorflow,frreiss/tensorflow-fred,aselle/tensorflow,alsrgv/tensorflow,xzturn/tensorflow,xodus7/tensorflow,girving/tensorflow,karllessard/tensorflow,dancingdan/tensorflow,xzturn/tensorflow,jalexvig/tensorflow,apark263/tensorflow,tensorflow/tensorflow,alsrgv/tensorflow,meteorcloudy/tensorflow,jbedorf/tensorflow,AnishShah/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,freedomtan/tensorflow,hfp/tensorflow-xsmm,ZhangXinNan/tensorflow,kevin-coder/tensorflow-fork,gunan/tensorflow,gunan/tensorflow,girving/tensorflow,drpngx/tenso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