aws/build.sh fixes
aws/build.sh fixes

 * Use AWS_FPGA_REPO_DIR if provided as location of aws-fpga
 * otherwise, look for aws-fpga next to connectal
 * otherwise, look for aws-fpga in home directory

Only attempt to create FPGA image if build created .Developer_CL.tar
file.

Only attempt to notify via SNS if EMAIL is set.

chenm001/connectal,cambridgehackers/connectal,cambridgehackers/connectal,cambridgehackers/connectal,cambridgehackers/connectal,chenm001/connectal,chenm001/connectal,chenm001/connectal,cambridgehackers/connectal,chenm001/connectal