Added a null check to GitlabGroup#setLdapAccess. 

Added a null check to GitlabGroup#setLdapAccess. This resolves a NullPointerException that was encountered when unmarshalling a a GitlabGroup JSON object with a null ldap_access attribute.

Added ability to get single build

Check to see if a group has ldap_access as null

Added ability to compare commits

Added ability to call getRawFileContent without making a project object

Added getBuildsArtifact method

I ran into an odd issue where the download files were 10MB too big
and were in an invalid .tgz format, but reading the byte stream
from the actual input stream instead of the reader fixed the issue.

[Enhancement] Add IDE plugins to build file

implements api for get tags, add tag and delete tag 

sanitize branches before calling api.

was having problem with a character '#' in a branch name

Added builds API for projects and commits

Added createBranch API methods

The example shows the parameters in the query string. It's actually in the body of the request

Added Tag and Release models

post 'line_type' parameter to gitlab when creating a commit comment