Fix #34: show date and type for each marker in sidebar

The markers are sorted by date in descending order.
about text
close about dialog #99
persistently unique markers. fixes #69
search box goes to dafault zoom, #98
Show icons for severity checkboxes, fixes #35
Clear markers when zooming out beyond max level, fixes #100
fixed mixup on checkboxes colors on hover
Added UTM convertor Python-node bridge to process.py
Merge pull request #104 from omribahumi/UTM-convertor

Added UTM convertor Python-node bridge to process.py
markers aggregation, fixes #101
Merge branch 'master' of github.com:hasadna/anyway
Converted cities.csv to cp1255 instead of UTF8
Updated process.py to use node bridge, load type 3 2013 accidents
changed marker id type to bigint to accomodate new unique marker ids
Fix capitalization of DicStreets files

process.py was getting an exception because the file was not found
Move checkbox code to sidebar.js; call loadMarkers, fixes #102
Simplify checkbox logic

Remove checkboxes completely and only use img elements.
Set tooltip to "multiple markers" if a marker will be spiderfied when clicked, fixes #106
Fix unspiderfy error due to missing bind()