Reorder method documentation to make more sense
Rewrite unicode doc to be more to the point
Documentation tweaks
Making setopt documentation useful
setopt can raise TypeError
Document setting unknown integer options
errstr is always a str instance
Document setopt(..., None)
Add missing labels for callbacks and unicode documents
Document unsetopt
Link to global_init documentation
Merge branch 'docs'

* docs:
  Link to global_init documentation
  Document unsetopt
  Add missing labels for callbacks and unicode documents
  Document setopt(..., None)
  errstr is always a str instance
  Document setting unknown integer options
  setopt can raise TypeError
  Making setopt documentation useful
  Documentation tweaks
  Rewrite unicode doc to be more to the point
  Reorder method documentation to make more sense
Resource retrieval quickstart example
Response headers quickstart example
Quickstart - writing to a file
Use WRITEDATA instead of WRITEFUNCTION for new code
Quickstart - following redirects and setting options
Quickstart - getinfo call
Include quickstart into main documentation
Sending form data quickstart example