* keep fastcgi connection open

* poor mans serialisation to make up for the lack of demuxing

* pointing includes to echse's repo

* Revert "pointing includes to echse's repo"

This reverts commit 281daad8d437ba88fadd65fae5af2da99d449bea.

* switch for persistent fcgi connections on/off added

* fixing ineffectual assignments

* camel case instead of _

* only activate persistent sockets on windows (and some naming conventions/cleanup)

* gitfm import sorting

* Revert "fixing ineffectual assignments"

This reverts commit 79760344e7b1231e59a2867246e7689b05e92e18.

# Conflicts:
#	caddyhttp/staticfiles/fileserver.go

* added another mutex and deleting map entries. thx to mholts QA comments!

* thinking about it, this RW lock was not a good idea here

* thread safety

* I keep learning about mutexs in go

* some cosmetics

* adding persistant fastcgi connections switch to directive

* Support for configurable connection pool.

* ensure positive integer pool size config

* abisofts pool fix + nicer logging for the fastcgi_test

* abisoft wants to have dialer comparison in _test instead of next to struct

* Do not put dead connections back into pool

* Fix fastcgi header error

* Do not put dead connections back into pool

* some code style improvements from the discussion in https://github.com/mholt/caddy/pull/1134

* abisofts naming convention