Improved _find_id3v2 method.
Improved _find_id3v2 method.

Check if the tag is in the beggining of the file (avoid some checks).
Decreased buffer size.
Removed compiler warning.


git-svn-id: 3b314052443b93febe203188962ed8b6ee39ceb7@76 fe9ffe84-2fc0-424c-a0c2-0ec162e4acf5

profusion/lightmediascanner,Pelagicore/Media-Manager-lightmediascanner-patched,Pelagicore/Media-Manager-lightmediascanner-patched,Pelagicore/Media-Manager-lightmediascanner-patched,profusion/lightmediascanner,profusion/lightmediascanner