Add coloring modes to the blame page (issue-2, pull request #125)

Blame output is now colored according to Commit (default), Author or
Age. Both Commit and Author output uses random colors whereas Age uses a
single color with varying tints applied to indicate the age.  White
indicates the eldest commit with the tint darkening as the commits get
younger.

Change-Id: I045458329af4765e91d5829ce3e8d28e21eeb66e
Bump bouncycastle version to 1.49

Change-Id: I0ea81f6c45748af3130721b8f8a7244eac9787fc
Merge "Bump bouncycastle version to 1.49"