Added a remove all button

Removes all tiles from list, cookie and screen
no ajax request on empty list

added condition to not poll ajax when the list is empty
JSON fix for one symbol

JSON doesn't branch when there is only 1 symbol, so referencing
quoteList[i] throws an exception
error checking for non-existent symbols
added CSS styling for "clear all" button
modified input to accept comma delimited lists
Update README.md
added hilliuse as an author
update project name to match domain
rename usage to installation/add usage tips
Update README.md
Update README.md
update cookie to two days
Update README.md
Merge pull request #2 from jusdev/master

update to latest version