chore:: Removes code for legacy Joomla 1.5 support
Chore :: Removes commented code from Rb_Form class

Refer : #31
Fix:: Removes admin javascripts in frontend

getDynamicJavascript function is written in Rb_View classs, which is
base for frontend and backend views. It by default renders javascript
for grid functionality. Now during frontend, default javascript will
not be rendered.

Impact : Test frontend validation, it should not be broken.

Test #33 (reverted from commit 133478c28962fcbd41cf5ff602318c055dc6482f)