added pagation to the main page.

Needs some designer attention.
fixed stupid url error
really fixed the url format
fixed indentation and style issues
changed sorting and labeling of requests from
'requested_datetime' -> 'updated_datetime' as suggested in
discussion of #56 .
Merge branch 'main_page_pagation' of github.com:tacaswell/srtracker into tacaswell-main_page_pagination

Conflicts:
	app.py
Add SRS_PAGE_SIZE to env-based configuration
Only do paging when SRS_PAGE_SIZE is set. Otherwise continue with the older, more standards-ish behavior.
initial work on getting drop-down drill down set up.  This simply
adds a non-functional drop down list
minor changes to naming/index.html
functional request type filter on landing page.
pep8 fixes
moved the drop down to a more logical location in the html
fixed tag lost during re-base
pep8 fixes
Think I tabified the indents
changed variable name from sID -> service_code
removed debugging print statements
Get the current service name so we can show it as the filter label.
Layout and style tweaks for the service type filter.