Release 1.0.

[rduplain]

With #3 done, it's time to release an official 1.0 of poorman. I'll take another pass at reviewing my own code and testing in large projects.

I'm considering a section in the README which adds a checksum for the tagged poorman release, since it's good practice to actually verify files that you download before running them. (What a concept!) I should also note in the README that master is intended to be stable so is fair to use directly if there's a feature not in the tagged release (but really we should be tagging releases liberally).

[rduplain]

cc: @amontalenti