replaced string concatenation with StringBuffer
removed unused private field
removed unused imports
removed print Stacktrace
added serialVersionUID
removed unused imports
removed commented code
renamed getter and field username to userName
removed redundant "implements" of interface because superclass already implements the interface
Merge remote-tracking branch 'origin/master'
add private constructor for constants class
renamed classes not ending with exception
renamed variable access_token to match the pattern
removed commented out code
made classes final
added braces to if statement
renamed redirect_uri and internal_id to match the pattern
changed setting of created and lastModified to a copy instead of a reference
added throwable to exceptions to not eventually loose stack trace
added serializable and serialVersionUID