Log Message:
Update to 0.12.1.5, based on PR 50203 by NONAKA Kimihiro.

Convert to github.mk while here.

Changes:

March 2015 update 0.12.1.5 (0.12-stable)
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This is bug fix release based on 0.12.1.

Bug fixes:
    change the tunable for fetching history when not found in file history cache \ 
fixes #917
    rename OPENGROK_REMOTE_REPOS to OPENGROK_GENERATE_HISTORY
    fallback to newer file if genre for older file is null fixes #832
    fix Solaris package install to depend on JRE 7

January 2015 update 0.12.1.4 (0.12-stable)
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This is bug fix release based on 0.12.1.

Bug fixes:
  check write object to be non null before calling close on it
  filter repositories based on list of directories before invalidating when \ 
doing partial reindex fixes #880

January 2015 update 0.12.1.3 (0.12-stable)
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This is bug fix release based on 0.12.1.

Bug fixes:
  change indexpart command in the OpenGrok shell script to require SRC_ROOT

January 2015 update 0.12.1.2 (0.12-stable)
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This is bug fix release based on 0.12.1.

Functional changes:
   add support for parallel indexing #876

November 2014 update 0.12.1.1 (0.12-stable)
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This is bug fix release based on 0.12.1.

Bug fixes:
  support branches for Mercurial repository #865
  Search link does not contain project #835