Added replace module

Heavily based on existing lineinfile module, but where it literally tests a regexp against
*each individual line* of a file, this replace module is more analogous to common uses of
a `sed` or `perl` match + replacement of all instances of a pattern anywhere in the file.

Was debating adding `all` boolean or `count` numeric options to control how many
replacements to make in the destfile (vs currently replacing all instances)

Noted use of MULTILINE mode in docs, per suggestion from @jarv
Adding 'export' option to subversion module (to export instead of checkout)
Adding example for svn export
Added ansible_date_time.weekday as a fact. This returns Monday,Tuesday,Wednesday,Thursday,Friday,Saturday, or Sunday depending on the remote servers time. Useful for backups the way I use it
'changed' key is not defined when task fails

fix KeyError introduced by fix of #6591.
Typo: assign not equal in boolean guard variable

Typo when variable controlling list of hosts left as available
Fix TypeError when using old simplejson lib.

On some very old simplejson does not support the 'encoding' and give
following exception:

   TypeError: __init__() got an unexpected keyword argument 'encoding'

This fix runs json.dump with no encoding key (such as before #a023cb) on
TypeError exception only.
Typo in setting task_errors variable
Strip() vault password file
strip() vault password file
Merge pull request #6679 from renard/fix-simplejson-module

Fix TypeError when using old simplejson lib.
Merge pull request #6673 from apenav/patch-1

Typo: assign not equal in boolean guard variable
Merge branch 'devel' of https://github.com/EvanK/ansible into EvanK-devel
Merge pull request #6658 from pilou-/fix_fix

'changed' key is not defined when task fails
Cleanup from merge of replace module and CHANGELOG update
Merge branch 'EvanK-devel' into devel
Make inventory parsing error detection smarter

If something is executable but doesn't look like it should be, or if
something is NOT executable and DOES looks like it should, show a
more apropos error with a hint on correcting the problem

Fixes #5113
Tweaking error message resulting from undefined template variables

Fixes #5114
Merge pull request #6656 from Jmainguy/setup

Added ansible_date_time.weekday as a fact. This returns Monday,Tuesday,W...
Ensure handlers run when meta tasks are defined and add handler integration tests

Fixes #6678
Fixes #6670