Commits on Aug 11, 2017

1. Fix SHA1 hash linking (go-gitea#2143) …

   This changes the regex to look for a hash from 7 to 40 characters,
   to match the use of abbreviated hash lookups in both git and github.
   The restriction of not being a pure number is also removed because
   1234567 is now considered a valid abbreviated hash, as is deadbeef.
   
   A note has been added to the top of the code to state that the
   literal regex match is fine, but no extra validation is currently
   performed so some false positives are expected.
   
   A future change could ensure that the hash exists in the repository
   before rendering it as a link, although this might incur a slight
   performance penalty.
   
   Reverts part of commit 4a46613 and fixes go-gitea#2053.

   

   rsmarples authored and lunny committed Aug 11, 2017
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