added close() calls in catch blocks
added logging module
first attempt with sqlite DB
getting the signing rules from SQL DB works
Merge branch 'master' into dev

Conflicts (resolved):
	chrome/content/dns.js
	install.rdf
auto inserting signing rules works
added default signers rules
set unpack property in Install Manifest to true
changed supported minVersion of Thunderbird to 24.0
small changes in dkimPolicy
updated signersDefault
dkim.js now uses logging.jsm
better exceptionToStr in helper.jsm
fixed adding of default rules
fixed observer for logging preferences
added button for adding must be signed exception
added options for signRules
Localization of dkim.js now by stringbundle
added nsITreeView for SQLite
added setCellText to SQLiteTreeView
signer rules can now be viewed via the options
rules can now be added and deleted over the options
autoAddRule now only if fromAddress is in SDID
added check that hash declared in DKIM-Signature is included in the hashs declared in the key record