slight cleanups
fixing path for apt config, trying out trusty
customized the location of the aptcache and buildplace to be arch specific. ANd enabling autocleanaptcache to prevent the accumulation of many GBs of data in past versions of debs
switching to use pbuilderrc instead of long command line
adding CCACHEDIR argument out of var
adding documentation and debuildopts as argument
updated to have proper unit tests
adding support for bindmounts
adding support for extrapackages and fixing keyring keyword in pbuilderrc