Improve GOROOT/GOPATH missing vars handling.
 Refs #422
Fix a resolving exception when adding invalid references as a reference destination.

Closes #411
Removing a spurious import.

Refs #411
Fix Range Intention on variadic parameters ...
add test case
Merge pull request #439 from josehsantos/fix_range_on_variadics

Fix Range Intention on variadic parameters ...
Enable or disable the build directory path based on the checkbox state
Merge pull request #440 from dlsniper/fix-build-dir

Enable or disable the build directory path based on the checkbox state
Added support for updating go packages
Automatically add GOPATH to SDK paths even when only one dir is in GOPATH
Added a check for GOPATH inside GOROOT
Merge pull request #443 from dlsniper/improve-go-get

Added support for updating go packages
Merge pull request #444 from dlsniper/always-add-gopath

Automatically add GOPATH to SDK paths even when only one dir is in GOPATH
Merge pull request #445 from dlsniper/gopath-in-goroot-check

Added a check for GOPATH inside GOROOT
Update run configuration to show the PSI / Formatter tool
Cleaning up reading of some env variables.
Change the way the project initializez on PHPStorm
Fix #441
Bumped SDK version to allow automatic upgrade of the SDK
Merge pull request #452 from dlsniper/fix-sdk

Improve SDK creation so that projects can be created in first directory of GOPATH (fixes #441)