Merge pull request #96 from bvssvni/master

Upgrade to latest Piston
Merge pull request #97 from bvssvni/master

Fixed compiler warnings
Fixes #93, Implements EnvelopeEditor widget with example, other small fixes and cleaning up.
Merge pull request #98 from mitchmindtree/master

Fixes #93, Implements EnvelopeEditor widget with example, other small fixes.
Add Travis CI
Merge pull request #102 from Indiv0/add-travis-ci

Add Travis CI
Add rust-ci
Merge pull request #103 from Indiv0/add-rust-ci

Add rust-ci
Handle new piston InputEvent model, Added basic WIP textbox with example.
Merge pull request #104 from mitchmindtree/master

Handle new piston InputEvent model, Added basic WIP textbox with example
Fixed a small text cursor bug, removed println! from Key matching loop.
Merge pull request #105 from mitchmindtree/master

Fixed a small text cursor bug, removed println! from Key matching loop.
text_box now responds to  and  keys.
Added condition so that text cannot be longer than the textbox itself
Animated text_box cursor
Merge pull request #106 from mitchmindtree/master

TextBox: Animated cursor, added `Left`/`Right` support, trigger callback on `Return`
Updated readme with available widgets and link to latest demonstration.
Merge pull request #107 from mitchmindtree/master

Updated readme with available widgets and link to latest demonstration.
Implement 32-bit conversion for Color
Implement Show for Color, closes #57