Bumps version to 0.15a1.
namevalue.py: Supports case normalization overrides.
recorder.py: Forces root logger level to be debug here too.
recorder.py: Uses field name case overrides to match hanzo warc-tools.
changelog: Updates latest to 0.14.1
Bumps version to 0.14.1.

Merge branch 'develop'

Conflicts:
	wpull/version.py