Revert "Truncate oversize 'tx' messages before relaying/storing."

This reverts commit c40a5aaaf484855a4350fd702e8e72fd21a68155.
Merge pull request #7 from Fantu/security-fixes

Revert "Truncate oversize 'tx' messages before relaying/storing." - part of CVE-2013-4627 fix