Update snippets according to the Crockford's code conventions

http://javascript.crockford.com/code.html
This removes unneeded semicolons, makes JSHint/JSLint not generate warnings, improves readability. The snippet for the anonymous function is now easier to use as a callback, because of no need to remove the semicolon every time.
Update indentation rules for the switch statement.

Again, according to the Crockford's code conventions ( http://javascript.crockford.com/code.html ). Improves readability.
Change the way "get" snippet works.

Easier to use.
Add new useful snippets: do, else, for in, setInterval, switch, try, while
Remove redundant snippets

"Object Value JS" literally duplicates the 'Object key — key: "value"' snippet.
"Object Method String" provides the code the I highly doubt that many people will use if any.
Update the info.plist with the changes to the snippets