Issue [#2046935]: Added support for "long text" and "long text and summary" for the LOCATION and SUMMARY fields.

Added a version number to help me determine which version of Date iCal is being used by something who's having problems.

Added the hook_date_ical_post_render() alter hook.

date_ical_format_text() was going way overboard on it's attempts
to make text iCal compliant. I got rid of all the escaping, and also
all the extra endlines which the drupal function was adding at 80-char
boundries.

I added the summary_field option to option_definition, which should
fix several (surprisingly unreported) errors related to Features and first-time
setup.

Added the view object as a parameter for theme_date_ical_icon, which gives
additional context for any module that would like to override that theme.

Issues [#1931020] and [#1935820]: Allow custom fields for summary. Fix repeating events causing duplicates. Add @file to DateIcalFeedsParser.inc

Applied patch #11 from [#1922658] to get around iCalcreator limitation with stream wrappers. Also made the amount of whitespace on blank lines consistent throughout the project.

- Issue #1529506, Added optional webcal:// support.
- Issue #1890736, Added ability to exclude the X-WR-CALNAME property.
- Issue #1565410, Sites with "Clean URLs" disabled can now download feeds normally.
- Several minor bigfixes, and cleanup of the iCal icon theming.