git-instaweb: Add option to reuse previous project config file
Add an option to git-instaweb which allows the usage of the old
gitweb_config.perl situated in '.git/gitweb' dir. When the option
is in use, gitweb_config.perl generated by git-instaweb won't be
overwritten.
Usage:
git instaweb --reuse-config
Example:
When I use git-instaweb, it is tiring to add customised
configuration (like highlight featues enabling) to the gitweb_config.perl
file everytime I initiate the server. With this,it's enough to use
this option.
Signed-off-by: Pavan Kumar Sunkara <pavan.sss1991@gmail.com>