iwallet v0.2.1

Release notes

1. add gas pledge and unpledge feature.
2. add ram buy and sell feature.
3. bug fixed.

How to install?

1. Download the xxx.crx file.
2. Go to chrome://extensions/ and turn on developer mode at the top right corner.
3. Drag and drop this file to chrome://extenions page and Confirm to install. If your chrome doesn't support to install crx file, follow step 4 and 5 to install.
4. Change the crx file's suffix name to .zip and unzip it.
5. Go back to the chrome://extensions/ page and click the Load unpacked extension button and select the unzipped folder for your extension to install it.