Added in PageReader/Writer DropDown/ RadioGroup

on PageReader Side
- Retrieve selected option in drop down by text / value
- Retrieve selected radio button in radio group (always by value)
- Check whether a radio group has a selected button or not

on PageWriter Side
- Select option in drop down by value / text
- Select radio button in radio group (always by value)

on ElementFinder

all TryFidnElements methods now have the possibilty to wait in seconds
in case the element is not available yet
Merge remote-tracking branch 'upstream/master'
Merge pull request #32 from Gwayaboy/master

Added support for standard HTML controls