`crew search` use to only return a single result if your query string
matched a package name exactly.

`crew search` now supports regex.

chronos@localhost / $ crew search ^lib
Found libpcap, version 1.8.1
Found libjpeg, version 9.1
Found libunwind, version 1.1
Found libxslt, version 1.1.28
Found libffi, version 3.0.13-1
Found libssh2, version 1.4.3
Found libtool, version 2.4.6
Found libpipeline, version 1.4.1
Found libevent, version 2.0.22
Found libxml2, version 2.9.2
Found libgd, version 2.0.33
Found libtiff, version 4.0.7
Found libpng, version 1.6.26
Found libsigsegv, version 2.10