doc update.
typos fixes.
Add another custom selector example (XLFormRowDescriptorViewController). Added valueTransformer XLFormRowDescriptor property.
disable switchcontrol on disable rowDescription
Merge pull request #53 from albsala/switchcellchanges

SwitchControl changes
Merge pull request #54 from xmartlabs/2_0_0

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update podspec.
Merge branch 'master' of github.com:xmartlabs/XLForm
update doc.
Merge branch 'master' of github.com:xmartlabs/XLForm into 2_0_0
minor doc update.
Merge branch 'master' of github.com:xmartlabs/XLForm
pod spec update
readme update.
multiple selector examples using NSValueTransformer
move all cells initialization to - (void)configure; method.
podspec update
README update
Update keyboard types.