Log Message:
Updated to latest release, 0.10.18. Move bin/pbr in post-install and use
ALTERNATIVES.

CHANGES
=======

0.10.8
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* Support script text override for newer develop

0.10.7
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* _get_revno only returns a commit count

0.10.6
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* Integration test PBR commits

0.10.5
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* Move write_pbr_json to avoid issues with nose

0.10.4
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* Properly check for git before getting git dir
* Use post version signifiers
* Only import sphinx during hook processing

0.10.3
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* Stop including git sha in version strings
* Write and read more complex git sha info

0.10.2
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* Remove all 2.7 filtering
* Stop filtering out argparse
* Remove mirror testing from the integration script

0.10.1
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* Prefix git suffixes with + instead of