Add "or_print" handlers for outputs

For when the output file is not a required option
Merge pull request #241 from adamrp/output_handlers

Add "or_print" handlers for outputs
Easy profiling of a command
mention profiling in changelog
removed hdf5 mention
Merge pull request #243 from wasade/auto_profile

Auto profile
HOTFIX: accidental tab caused indent error
Merge branch 'master' of https://github.com/bipy/pyqi