add test for #438(not run),add test for import path not found
Merge pull request #854 from bronze1man/pr-add-test-for-importPath-not-Found

add a way to test multiple files in one test case in GoInspectionTestCase, add test for #438(not run),add test for import path not found
Updated documentation
Remove unused function
Various improvements based on inspections
Unify GO bin path access
Allow goimports and go fmt to run for AppEngine projects
Improve handling of GOROOT, GOPATH and GOROOT for AppEngine
Remove unused imports
Really remove all dependencies on GOPATH from environment