Extract BW::HTTP to the bubble-wrap-http gem. fixes #308
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UI now depends on constants.rb
update warning messages about bw http
1.6.0.rc1

- 'bubble-wrap/http' is now deprecated and will be removed in 2.0, see https://github.com/rubymotion/BubbleWrap/issues/308

+ `BW::UIActivityViewController` wrapper added, see https://github.com/rubymotion/BubbleWrap/pull/335

+ `BW::NetworkIndicator` added, see https://github.com/rubymotion/BubbleWrap/pull/349

 + `BW::Location.get_compass` & `BW::Location.get_compass_once`see https://github.com/rubymotion/BubbleWrap/pull/348

+ `NSString#to_color` ARGB support, see https://github.com/rubymotion/BubbleWrap/pull/350

+ `Object#method` support for `BW::Reactor`, see https://github.com/rubymotion/BubbleWrap/pull/359

* Prevented a possible exception when stopping `BW::Location`, see https://github.com/rubymotion/BubbleWrap/pull/358

* Fixed a bug when requiring just 'bubble-wrap/ui'
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