git alternate command

[Chris Packham <judge.packham@gmail.com>]

Here is the latest version of my git alternate command. The major difference to
the last update is additional tests for deleting alternates and some updates to
the test based on Hannes' feedback.

I still am intending to add documentation and to look into Stephens suggestions
for changing the UI to use add|delete|show instead of -a|-d.

I'm also interested in any feedback regarding the actual output from the command.

Cheers,
Chris

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 Makefile                 |    1 +
 git-alternate.sh         |  156 ++++++++++++++++++++++++++++++++++++++++++++++
 t/t1430-alternate-cmd.sh |  154 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 311 insertions(+), 0 deletions(-)