* Allow for SQL concatenation of nodes that resolve to literals
If node.Y resolves to a literal, it will not be considered as an issue.
* Fix typo in comment.
* Go through all files in package to resolve that identifier
* Refactor code and added comments.
* Changed checking to not var or func.
* Allow for supporting code for test cases.
* Resolve merge conflict changes.
- Get rid of 'core' and move CLI to cmd/gas directory
- Migrate (most) tests to use Ginkgo and testutils framework
- GAS now expects package to reside in $GOPATH
- GAS now can resolve dependencies for better type checking (if package
on GOPATH)
- Simplified public API
