Consistency between 10.9 and 10.10 rendering.

Made constraints a fixed width and resolved text alignment issues. This
should help text in the GUI display more consistently between 10.9
(which uses Lucida Grande) and 10.10 (which uses Helvetica).

Also updated the podfile with AutoPkgrTests targets to resolve a build
issue.
Merge pull request #201 from lindegroup/10.9-10.10-gui-alignment

Consistency between 10.9 and 10.10 rendering.