Added diff_match_patch_php submodule and implemented delta encoding.
Preliminary page_context and page rendering. Merging and delta encoding has issues.

Conflicts:
	inc/application.php
	inc/database.php
	inc/util.php
Updated README text for install/config.
Tighter integration of page rendering with existing pages.
Merge pull request #34 from gundermanc/features/page_rendering

Page loading and drawing code.