Hacking environment for Pinto

The added script eases setting up an environment for hacking Pinto.

The assumption is that the user checks out Pinto's repository from
GitHub and then runs:

   etc/hack.sh

This creates a local library with relevant modules from Stratopan
and puts them in subdirectory llib. It also adds a bash file that
can be source-d to setup the right environment variables.

Apart from the script, there is a modification to .gitignore to
ignore the llib subdirectory.

Before merging, it might be considered to change "llib" into
something more intuitive like "hacklib".
Fix use of uninitialized value in concatenation (.) or string at t/lib/Pinto/Server/Tester.pm line 91.

Displays an error when you run the tests on debian sid perl 5.18.1:

t/03-remote/02-responses.t .......... ok
t/03-remote/03-install.t ............ Use of uninitialized value in concatenation (.) or string at t/lib/Pinto/Server/Tester.pm line 91.
t/03-remote/03-install.t ............ 7/? Use of uninitialized value in concatenation (.) or string at t/lib/Pinto/Server/Tester.pm line 91.
t/03-remote/03-install.t ............ ok
t/03-remote/04-install-with-auth.t .. Use of uninitialized value in concatenation (.) or string at t/lib/Pinto/Server/Tester.pm line 91.
t/03-remote/04-install-with-auth.t .. ok
t/04-server/01-functional.t ......... ok

t/lib/Pinto/Server/Tester.pm:

87  has server_url => (
88      is       => 'ro',
89      isa      => Uri,
90      init_arg => undef,
91      default  => sub { URI->new( 'http://' . $_[0]->server_host . ':' . $_[0]->server_port ) },
92  );

Displayed warning because $_[0]->server_host is undef.

During object construction, defaults are not generated in a predictable order,
so you cannot count on some other attribute being populated when generating a
default.
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Merge pull request #115 from borisdaeppen/master

Mention other Docs in the Tutorial
Merge pull request #117 from dsteinbrunner/patch-1

typo fixes
Merge pull request #114 from gashev/fix_use_of_uninitialized_value_in_concatenation_or_string

Fix use of uninitialized value in concatenation (.) or string at t/lib/Pinto/Server/Tester.pm line 91
Merge pull request #113 from polettix/topic/hacking

Hacking environment for Pinto

Use this to set up dependencies for hacking on Pinto.
fix typo in "help delete"