Building as dynamic module support

[cryptofuture]

Ability to build module as dynamic nginx module. (converted to dynamic)
Description here.

[agentzh]

@cryptofuture Please review the patch from pull request #4 since that pull request requires its own review and modification process. In general, pull requests should be minimal and self-contained.

[cryptofuture]

I added it after this pull request in fork I use for nginx ppa I maintain. Sorry, I didn't thought about applying request 4 in new branch. Basically you can apply request #4 first (since nothing bad with it), then apply #9 , or merge it separately. Otherwise I can just close this one, refork things and recreate pure pull request (will do it if you don't reply next hour)

[agentzh]

@cryptofuture #4 cannot be merged as-is. It requires coding style fixes at least.