Update send_mail_template to pass optional email headers to the EmailMultiAlternatives constructor.  Rather than having the form page_processor send mail from user submitted email addresses (if present) have it specify the Reply-To header.

--HG--
branch : forms_reply_to
Fix UnicodeDecodeError for python3 setup.py bdist_rpm

`python3 setup.py bdist_rpm` gave the following error:

	Traceback (most recent call last):
	  File "setup.py", line 60, in <module>
	    long_description=open("README.rst").read(),
	  File "/usr/lib64/python3.3/encodings/ascii.py", line 26, in decode
	    return codecs.ascii_decode(input, self.errors)[0]
	UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 11646: ordinal not in range(128)

While Python3 is unsupported yet, why not make it easier in the future?
Get rid of FORMS_DISABLE_SEND_FROM_EMAIL_FIELD, always add the Reply-To header if there is an email_to.

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branch : forms_reply_to
Adding template accessible settings into context for rendering templates for emails.
Handling case when diff between min and max count is smaller than size

Weights were not calculated correctly when difference between `max_count` and `min_count` was smaller than `settings.TAG_CLOUD_SIZES`. Changed calculation of weights to use floating point arithmetic. The results of weight calculations using old and new code are shown below:

http://ideone.com/fXs5aG
Adding .control-label to form_fields.html
Indent .control-label
Added Cristian Ciupitu to AUTHORS
Merge.
Merged in joshcartme/mezzanine/forms_reply_to (pull request #49)

Forms Reply-To rather than replying as
Merge.
Merge.
Added Danny Sag to AUTHORS
Be a bit more explicit with request arg in settings context processor.
Merge.
Added Troy Harvey to AUTHORS.
Merge.
Added Ahmet Bakan to AUTHORS.
Added mezzanine-meze to third-party apps list.
Added support for Django 1.6

- The situations in which contribute_to_class is called have changed.
- Fixed DeprecationWarning about simplejson
- Explicitly set the TEST_RUNNER to the pre 1.6 one.
- Set default=False on BooleanField