CP-8629: Adding travis requirements.

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
Reviewed-by: Mate Lakat <mate.lakat@citrix.com>
CP-8629: Don't use travis for xs64bit yet

Disable travis CI on the xs64bit branch. An internal Jenkins instance is
used to check that branch.

Signed-off-by: Mate Lakat <mate.lakat@citrix.com>
Reviewed-by: Mate Lakat <mate.lakat@citrix.com>
Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
CP-8629: Add travis and coveralls badges

The badges will display the build status of the master branch.

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
Reviewed-by: Mate Lakat <mate.lakat@citrix.com>