cleanup perl frameworks installation scripts, see #966
Update the Perl Kelp framework

Added additional test routes according to the requirements at
http://www.techempower.com/benchmarks/#section=code
Update README.md for Perl Kelp

Added more information on how to deploy a Perl Kelp application via
uWSGI and Plack, as well as the CPAN modules to install.
Indicate that kelp using nginx
Remove kelp dependency on running code from ~/FrameworkBenchmarks
Use Travis cache.

[skip ci]
Merge pull request #987 from methane/travis-cache

Use Travis cache.
remove hard-coding of paths in perl frameworks
Update nginx user for kelp
Merge remote-tracking branch 'hamiltont/kelp-944' into perl

Conflicts:
	kelp/install.sh
use latest version of perl-build
fix nginx on dancer plack and web-simple (hopefully)
dancer plack and web-simple depend on nginx being installed
fix typo in plack setup
Merge pull request #986 from jberger/perl

Cleanup perl frameworks installation scripts

Closes #966