Merge pull request #150 from GuillaumeGomez/master

Fix cargo build error
Add new widget : FileChooserWidget
New widget : ColorChooserWidget
New widget : ColorChooserWidget
Merge pull request #152 from GuillaumeGomez/master

Update to last rust compiler version
Merge pull request #151 from GuillaumeGomez/new_widget

Add new widget : FileChooserWidget
Explicitly borrow slices
Merge pull request #153 from oakes/master

Fix TreeView example
update build configuration in cargo.toml
remove old autoconf files
Merge pull request #154 from jeremyletang/new-build-cmd

update build configuration in cargo.toml
Rename gtk widgets to more rust like style