Update CHANGELOG.md

Bump version to 1.1.0

Rename the package on NPM. Start to use semantic versioning.

Fix variables.less import.

Add a rz-slider-disabled attribute. Closes angular-slider#117

Support ticks for range and always visible bars

Update version number

Update version number

Update bower due to new folder structure

Implement a on-start and on-end callback as requested in angular-slid…

…er#121 and angular-slider#86.