re-formatted the file according to one-line-per-sentence style
slightly change the structure of manual/customization
Merge sa2ajj/buildbot:docs-customization (PR #1186)
remove compiled python modules

* quite helpful when you do module re-factoring
add plugin infrastructure for Buildbot

* add IPlugin interface that should be a base for all interfaces that can be
  delivered as a plugin
* add `buildbot.plugins.db` to load and check plugins
* add basic unit tests
adopt plugin system for www service
provide bundled change sources as plugins

* this should help to "unify" the way changes sources are defined
provide bundled schedulers as plugins
provide bundled build slaves as plugins
be explicit about wildcard import

* this allows to inject them into configuration file and access necessary bits
  in a bit shorter way
provide bundled steps as plugins
provide bundled status receivers as plugins
introduce 'util' category of plugins

* this will help to make master.cfg files that only use core functinality to
  look much simpler
update sample for master.cfg to use plugins
update user manual

* Work In Progress
update developer documentation

* Work In Progress
update release notes