update readme.md, .meteor/relase (0.7.1.2) and simplify code:

 * remove unused attributes from map template
   and merge notice divs
 * clean up styles.css
 * move window.resize stuff from client.coffee to main.js
remove client.coffee
replaced client.coffee with client.js and

 * changed to OpenStreetMap Mapnik layer
 * use Object.keys to loop through all layers
simplify adding/removing markers logic:

 * use cursor.observeChanges insted of cursor.observe;
   quote from the Meteor documentation:
     observeChanges is significantly more efficient
     if you do not use addedBefore or movedBefore
oops: center the map on the original location
remove console.log from client.js
Merge pull request #5 from wbzyl/javascript-version

JavaScript version of meteor-leaflet-demo