fix path of pod of perl*

installed directory of perl*.pod differs from operating system...
http://perl5.git.perl.org/perl.git/blob/e2a4306ace4a19cb3a434e4eb9fedad6ff1248b4:/installperl#l531
Merge pull request #2 from sugyan/pods_directory

fix path of pod of perl*
Set PERL5LIB when executing perldoc command

User can use 'helm-perldoc:perl5lib' as value of PERL5LIB.

And apply (#3) change, because it cannot be merged by another
pull request.
fix ":buffer" keyword

`helm-perldoc` passed created buffer to ":buffer" keyword. but it needs string value.
(it causes problems in `helm-resume` with prefix arg.)
Merge pull request #4 from syohex/improve-searched-path

Set PERL5LIB when executing perldoc command
Merge pull request #5 from sugyan/buffer_name

fix ":buffer" keyword
Update document about PERL5LIB variable
Use cl-lib instead of cl.el

cl.el is no longer used in helm.el
Merge pull request #6 from syohex/switch-cl-lib

Use cl-lib instead of cl.el
Escape characters in helm-perldoc:perl5lib
Merge pull request #7 from syohex/escape-perl5lib

Escape characters in helm-perldoc:perl5lib
Add installation explanation
Add perl script for collecting modules
Apply new collecting modules
Merge pull request #11 from syohex/use-new-perl-script

Apply new collecting modules
Bump up version update Changes
Pass helm-perldoc:perl5lib to collecting script as PERL5LIB
Merge pull request #12 from syohex/fix-for-perl5lib

Pass helm-perldoc:perl5lib to collecting script as PERL5LIB
Bump up version and update Changes
Initial carton supporting implementation