Issue #732 Parse and inject all messages available in the buffer
Add a period in the change log
Merge pull request #733 from mozilla-services/issue_732

Issue #732 Parse and inject all messages available in the buffer. Resolves #732.
Release date / version bump for v0.5.0 release.
Version bump on versions/0.5 branch after 0.5.0 release (i.e. in
anticipation of v0.5.1).
Post v0.5.0 release version bump on dev (i.e. in anticipation of 
eventual v0.6.0 release).
Add support for 'missing' as a match key to support ordering on
missing match values, and fix a bug w.r.t. lowercasing match variable
names.
Remove error-causing slashes from the match_regex sample config.
Add 'txt' to code-block declaration, since leaving it off causes the text
to not be rendered.
Escape backslashes so they render as desired.
Merge pull request #737 from mozilla-services/versions/0.5

Add support for 'missing' as a match key to support ordering on
Merge pull request #738 from mozilla-services/no-regex-slashes

Remove error-causing slashes from the match_regex sample config.
Merge branch 'versions/0.5' into dev
Avoid an extra call to parse when the entire buffer is consumed.

The buffer offsets were reset but the the needData flag was not.
This causes an extra call to parse, the first to set the flag and
then next to read more data an attempt a parse.
Merge pull request #745 from mozilla-services/stream_parser

Avoid an extra call to parse when the entire buffer is consumed.
Merge pull request #746 from mozilla-services/versions/0.5

 Merge branch 'versions/0.5' into dev
Config directory support.
Add note re: regex tester.
Merge pull request #748 from mozilla-services/doc-regex-tester

Add note re: regex tester.
Merge pull request #747 from mozilla-services/logstreamer-dir-config

Config directory support.