Add View Variables plugin
Handle pre/post #261
Remove unneeded import of track.
Show variables for tracks without files
Show multi-value variables as lists.
Fix display of multi-value for id3v23
Add Album Artist Website plugin - see PICARD-26

Adds a plugin to get the artist homepage MB relationship and insert into
website (ID3 WOAR tag).

Note: I used this plugin as a trial for using a Picard xml module to
handle MB WS2 xml response. See PICARD-581.
Add NEWS.txt
Remove unneeded imports
Minor tweak to display if variable is null string
Handle album finalisation correctly.
Move ID3Metadata functionality to new_metadata property

The problem with ID3Metadata is that it changes the behavior of
Metadata methods in undesirable ways (see PR #273).

This adds a new_metadata property to File classes which returns a copy
with the values modified as they'd be displayed/saved. This should more
composable and less error-prone than overriding Metadata methods across
the board.
Allow user to toggle debug mode from log dialog at runtime
Add new PICARD_BUILD_VERSION_STR

It can be set by external script at build time.
PICARD_VERSION should not be modified.

See http://tickets.musicbrainz.org/browse/PICARD-592
Merge pull request #289 from zas/build_version

Add new PICARD_BUILD_VERSION_STR
Add build scripts fro win and osx, add patch_version command to setup.py
Merge pull request #290 from zas/build_scripts

Add build scripts fro win and osx, add patch_version command to setup.py
Improve --version and About version display

Introduce PICARD_FANCY_VERSION_STR and simplify code.
Merge pull request #288 from zas/debug_mode

Allow user to toggle debug mode from log dialog at runtime
Update NEWS.txt