Log Message:
devel/mustach: Update to 1.2.2

(Also adds test target)

Changes in 1.2.2:

Fix:
 - Fix: SONAME of libmustach-json-c.so

Changes in 1.2.1:

New:
 - Add SONAME in libraries.
 - Flag Mustach_With_PartialDataFirst to switch the
   policy of resolving partials.
Fix:
 - Identification of types in cJSON

Changes in 1.2.0:

New:
 - Add hook 'mustach_wrap_get_partial' for handling partials.
 - Add test of mustache specifications https://github.com/mustache/spec.
Changes:
 - Mustach_With_SingleDot is always set.
 - Mustach_With_IncPartial is always set.
 - Mustach_With_AllExtensions is changed to use currently known extensions.
 - Output of tests changed.
 - Makefile improved.
 - Partials are first searched as file then in current selection.
 - Improved management of delimiters.
Fixes:
 - Improved output accordingly to https://github.com/mustache/spec:
   - escaping of quote "
   - interpolating null with empty string
   - removal of empty lines with standalone tag
   - don't enter section if null
   - indentation of partials
 - comment improved for get of mustach_wrap_itf.