MLHR-1139 #resolves added http get operator which gets query parameters ...

...from incoming tuple

Squashed commit of the following:

commit eb6efa67b9a91a122e715af67ef332d65a35a4f4
Merge: 33ae322 9e92d6f
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Wed May 28 15:05:11 2014 -0700

    Merge branch 'master' of https://github.com/DataTorrent/Malhar into SPOI-2494

commit 33ae3226005cb63c9747ed28abd81a428b8805db
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Wed May 28 15:01:00 2014 -0700

    added abstract http get multi value map operator

commit 0e28538c1ca572812c3e76a83f32534e1c9d9336
Merge: f1af83c 33ee34a
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Fri May 23 15:34:58 2014 -0700

    Merge branch 'master' of https://github.com/DataTorrent/Malhar into SPOI-2494

commit f1af83c92b431b7b9da7054a928b5a6b7392b692
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Thu May 15 11:46:24 2014 -0700

    clean up

commit d66ce22bea481fa2f9d721828b3a3296e0960d28
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Thu May 15 11:34:17 2014 -0700

    added http get operator with map input port for query parameters

commit 91b3895769f6b4476e8fe88a233bb746f15fc06d
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Mon May 12 19:16:33 2014 -0700

    clean up

commit 9c108cd370d695d540dad2fddd9b520bbc840248
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Mon May 12 19:06:15 2014 -0700

    renamed HttpOutputOperatorTest to HttpPostOutputOperatorTest

commit 173be15c017eff53fd426efadac6091169f5c926
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Mon May 12 18:44:41 2014 -0700

    changed method call to set the url

commit c07d4b5c077405bbb1406f8be03f0ebdf852ce2a
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Mon May 12 18:44:03 2014 -0700

    added HttpGetOperator to send get requests and process responses if output port is connected

commit 6620a1f3f730e936c3645e74411a89fb34cb1d30
Author: Ashwin Chandra Putta <ashwin@datatorrent.com>
Date:   Mon May 12 18:43:15 2014 -0700

    added abstract http operator and renamed HttpOutputOperator to HttpPostOutputOperator