Bumps version to 0.6a1.
Updates MANIFEST.in to include unit test txt files.
Fixes readme not included in MANIFEST.in.
Git ignores MANIFEST, .settings.
Implements --concurrent option.
WARCRecorder: Sets the required target-uri for log record.
Implements --warc-append.
Sets the default for --read-timeout to 900.
Fixes truncate for older versions in WARCRecorder.
badapp.py: Changes loop to finite.
Bumps version to 0.6.

Merge branch 'develop'

Conflicts:
	wpull/version.py