Add support for GO 1.4 and older
fix #1021
Merge pull request #1035 from bronze1man/pr-1021

fix #1021
Updates as per feedback
Don't run the function call inspection on cast expressions.

Closes #1037
Don't treat method expressions separately when parsing.

Closes #865
Add some NPE guards for in inspections.

Closes #1040
Merge pull request #1033 from dlsniper/fix-go14-detection

Add support for GO 1.4 and older
Cleanups