[cogl] (8 commits) Created branch wip/neil/snippets

[Neil Roberts <nroberts src gnome org>]

The branch 'wip/neil/snippets' was created.

Summary of new commits:

  c66a91a... Add a CoglSnippet type
  71d495c... cogl-pipeline: Add two hook points for adding shader snippe
  188ce5c... Add a conformance test for CoglSnippets
  04a3419... pipeline: Wrap each snippet in its own function
  666c45b... snippet: Add a 'replace' string
  58d5f0d... pipeline: Move the snippet source loop into a common functi
  60596a4... pipeline: Add a snippet hook for the texture lookup
  1a1dcab... pipeline: Assume blend enabled when there are snippets