Changed interpreter from /bin/sh to bash so string substitution wouldn't explode

"cproc=${proc//[^A-Za-z0-9_]/_}" would break (Bad Substitution errors) on my Debian Wheezy system. Changed the interpreter to bash and script began to run without issue.
Merge pull request #390 from inhumantsar/patch-1

Changed interpreter from /bin/sh to bash
Update haproxy_rate_frontend

Just a typo on line 86, change "sencond" for second
Use correct line endings for the sa-learn plugin
Merge pull request #394 from ercpe/master

Use correct line endings for the sa-learn plugin
Merge pull request #393 from fcomparini/patch-1

Update haproxy_rate_frontend