Dev fix: sInputFilter class wan't being applied when using the _INPUT_
macro

Fixes DataTables/DataTables issue #260
Fix: Numbers incorrectly detected as dates in Chrome

- Chrome (V8) will incorrectly detect '$245.12' and similar as dates,
  since V8 will strip unknown characters from a string given to
  Date.parse and then attempt to parse the rest of the string - in the
  example above: Dec, 245:
    https://code.google.com/p/v8/source/browse/trunk/src/dateparser-inl.h#72

- The fix implemented to to check for a leading a-zA-Z, number or +-.
  Although this isn't a perfect match for what Chrome does, it, I think,
  a good enough effort to chatch nearly all particular use cases.

- Additionaly, V8 will try to parse a single number passed into
  Date.parse - 1-12 are months, 32+ are years. As such, the numeric type
  detection much be a highter priority than the date detection, since
  Chrome might incorrectly use a column as a date. It would sort
  correctly, but it isn't "correct".

- The take away from this is that Date.parse cannot be used for date
  format validation on its own...
Merge branch 'master' of github.com:DataTables/DataTablesSrc