[FIX] Show error msg when insufficient XRP to send

If the user does not have enough XRP and there are no alternative paths,
an informative error message is displayed.
[FIX] Click on order in "My Orders" -> sometimes wrong orderbooks show (RT-2193)
[FIX] Accept valid Ripple names without leading ~

Check if the ripple name is valid if the rp-dest-ripple-name-no-tilde
attribute has been specified and the value does not begin with a ~
[FIX] Accept valid Ripple names without leading ~

Add new rp-dest-ripple-name-no-tilde attribute to the Ripple name fields
in Add Contact and Edit Contact forms
[FEATURE] Export history as a .csv

Add required dependency to support download in IE
[FEATURE] Export history as a .csv

Copy downloadify.swf to swf dir (required to support download in IE)
Merge pull request #1495 from bss-/downloadify-dep

Downloadify swf required for "Export to CSV" button on IE
[DOC] Update README

Some npm packages require python 2, so the README should list it as a dependency.

Also the README should say something about ripple.txt.
[TASK] Set usable default url in config-example

By changing the domain in config-example to local.ripple.com, the config is usable as a starting point for development by simply copying the file to config.js. It does still require the hosts file to be updated of course.
Merge branch 'develop' into release
[FIX] Send URI is defaulting to XRP (not the correct currency) (RT-2060)
[FIX] UI Cleanup: Total balances styling changes
-Consistent on decimal points: XRP and XAU show 4 decimals point and others show 2
-Visual styling of the amount cleaned up
Merge pull request #1488 from orzFly/fix/currency_pair

[FIX] Click on order in "My Orders" -> sometimes wrong orderbooks show (RT-2193)
Merge pull request #1493 from bss-/contacts-ripple-name-no-tilde

Contacts ripple name no tilde
Merge pull request #1503 from Madsn/update-readme

[DOC] Update README
[TASK] bump ripple-lib to 0.8.1
Merge pull request #1506 from mrajvanshy/knox

[FEATURE] UI for Knox/Snapswap Integration
[FIX] index.html: add meta tags
[TASK] make me a webmaster
[TASK] Memo field: Add version to all transactions