De-duplicate code that base64 encodes strings in SecurityHelpers.
Remove various unneeded parens in SecurityHelpers.
Add myself to the contributors file.
Fixed comment for devMode

* Standardized productionMode comment with others
DoubleField can be set from JInt
IntField/LongField can be set from JDouble
Updated contributors.md
Cleaned up Double/Int/LongField imports
Adding ajaxEditableSelect to SHtml. Allows users to dynamically add new selections into an ajaxSelect.
* Updated sbt to 0.12.1
* Fixed a compiler error due to wring rebase
Added clearAttrs method to S