Merge pull request #20 from hey-you-project/dev_branch

edit user validation
Merge pull request #21 from hey-you-project/dev_branch

added fail tests for users
during user creation, ignores case sensitivity to check previous users
requires usernames to be at least three characters long
Merge pull request #22 from hey-you-project/usernamecases

Usernamecases
added myposts and json check