Specified manual build tag for binaries with main.

This is needed to prevent 'main redeclared' error when doing 'go get ./...' or 'go install ./...'
moved command line utilities to their own folders.
Merge pull request #9 from deboshire/feature/fix_go_install

[build fix] Moved cmd tools to each own directory.
Merge branch 'develop' into feature/data_representation