Bump min saharaclient version

* 0.6.0 has been released about a half of year ago;
* there is a bunch of significant bug fixes and improvements since
  0.6.0;
* savanna aliases has been removed;
* requirements are up to date for Juno.

Change-Id: I2e4d618ad077a7950879087b47cccf82e8595ded
Add xstatic-font-awesome for Horizon

Font awesome is an icon font -- a way of including scalable icons
in a web application.

Change-Id: Id1eae352b63a063429032965afb16de4c0c32150
Partial-implements: bp/font-icons
Merge "Add xstatic-font-awesome for Horizon"
Merge "Bump min saharaclient version"