git: Add ignored commits file

This can be used to tell git to ignore bulk renaming commits like the
recently-finished module hierarchy refactoring. Configured with,

    git config blame.ignoreRevsFile .git-ignore-revs

.git-ignore-revs

+# Configure git to ignore commits listed in this file with:
+#
+#   git config blame.ignoreRevsFile .git-ignore-revs
+
+# Module Hierarchy Renamings
+af332442123878c1b61d236dce46418efcbe8750
+255418da5d264fb2758bc70925adb2094f34adc3
+1941ef4f050c0dfcb68229641fcbbde3a10f1072
+528df8ecb4e2f9c78b1ae4ab7ff8230644e9b643
+18a346a4b5a02b8c62e8eedb91b35c2d8e754b96
+817f93eac4d13f680e8e3e7a25eb403b1864f82e
+1b1067d14b656bbbfa7c47f156ec2700c9751549
+240f5bf6f53515535be5bf3ef7632aa69ae21e3e
+1500f0898e85316c7c97a2f759d83278a072ab0e
+3ca52151881451ce5b3a7740d003e811b586140d
+cf739945b8b28ff463dc44925348f20b3c1f22cb
+da7f74797e8c322006eba385c9cbdce346dd1d43
+6e2d9ee25bce06ae51d2f1cf8df4f7422106a383
+d491a6795d507eabe35d8aec63c534d29f2d305b
+99a9f51bf8207c79241fc0b685fadeb222a61292
+eb6082358cdb5f271a8e4c74044a12f97352c52f
+5119296440e6846c553c72b8a93afc5ecfa576f0
+447864a94a1679b5b079e08bb7208a0005381cef