Fix sourcing the pull-all script from some location other than tools/bin
Fix sourcing the pull-all script from some location other than tools/bin

Polymer/tools,jorgecasar/tools,imrehorvath/tools,imrehorvath/tools,Polymer/tools,addyosmani/tools,Polymer/tools,Polymer/tools,addyosmani/tools,jorgecasar/tools