* Moved the CLI into cmd package.
* Broke out each subcommand into own file.
* Created a version subcommand, which allows the binary to be built
  with version information when passed the following LDFLAGS.

    LDFLAGS := -s -w \
	-X 'main.version=$(VERSION)'
	-X 'main.buildHash=$(GITCOMMIT)'
	-X 'main.buildDate=$(BUILDDATE)'

Since the CLI imports gcw the vendor/ directory should
live at the base of the repo.  This also brings the project
in line with most other go projects.  Updated Makefile and
gitignore to preserve functionality.

This reverts commit 5d68bd0.

This should allow the CLI to remain using vendored packages, while
keeping dependencies as minimal as possible with the importable
package.