Send Perl warnings to Zentyal log file in webadmin

This is shown as follows:

2014/03/14 10:29:04 WARN> zentyal.psgi:43 main::__ANON__ - Odd number of elements in hash assignment at /usr/share/perl5/EBox/Dashboard/ModuleStatus.pm line 47, <GEN0> line 128.
Merge branch 'master' into ejhernandez/warn-on-debug

Conflicts:
	main/core/ChangeLog
Merge pull request #1150 from Zentyal/ejhernandez/warn-on-debug

Send Perl warnings to Zentyal log file in webadmin