Container formats with specific, low-false-positive magic matches need a slightly higher priority, so that they don't accidently end up being matched based on the contents of the container near the start of the file. Partly solves TIKA-1292. This closes #6 github pull request

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1596590 13f79535-47bb-0310-9956-ffa450edef68