Fixed date formatting for 'h', added tests.

Removed extra integer_to_list conversion from tag_to_value/3 for $h.
Added tests for "h", "H", "i", and "Y" to each test case.
Merge pull request #30 from bluegraybox/master

date 'h' format fix
More flexible "_" function
Extend the regroup syntax to support nested keys

This commit allows the user to use nested regroup keys. ie.

    {% regroup builds by host.name as hostname_list %}
Make dictsort use deep find
Add testcases for nested regroup and dictsort
Merge pull request #27 from garazdawi/regroup_extend

Allow nested keys in regroup and dictsort
Add unit tests for {% elif Expr %} syntax
Add support for {% elif Expr %} syntax
Merge pull request #35 from psyeugenic/egil/support-elif

Support {% elif %} clause in if template tag syntax
Added postgresql timestamp output format test.
Added handling floating point seconds in time tuples.
Use integer_to_list_zerofill instead of regular integer_to_list.
Refactored and fixed a bug when seconds (float or integer) < 10.
Updated datetime 4 test to reflect last logic change.
Merge pull request #36 from runejuhl/fix-pgsql-timestamp

Fix pgsql timestamp
is_float is a lot better than not is_integer...
Merge pull request #37 from runejuhl/fix-pgsql-timestamp

is_float is a lot better than not is_integer...
Updated add filter to match language spec
Merge /Users/steve/Projects/Calendapp/deps/erlydtl