Merged scripts directory into model to clean up root a little
Imported trex regexp library from http://tiny-rex.sourceforge.net/
First patch for regular expression support in CZMQ

- class will be zrex
- I'm using T-rex, a tiny regexp library imported into foreign/trex
- main use case for zrex is parsing config files and certificates
- fixed some warnings in the T-rex code but otherwise left it as-is
Finished first draft of zrex

- collects matching sequences
- provides these to caller
Restored all selftests
Fixed unitialized variable warning
Merge pull request #268 from hintjens/master

Adding regular expression support (zrex)