[CentOS-devel] Centpkg: Update documentation, catch exceptions, and a version bump

[PATCH 1/3] Catch exceptions when running commands for a nicer experience when things go wrong
- Top-level exception handling was turned off in earlier versions to make debugging easier

[PATCH 2/3] update the readme to make the epel installation step more clear
- As requested: http://lists.centos.org/pipermail/centos-devel/2014-July/011321.html

[PATCH 3/3] bump the version number to 0.1 for the first RPM
- Since local builds work, this is probably a good place to build the first RPM