v0.3.0.RELEASE

Change logs:

• Automated builds on docker hub is now supported. (#54)
• FileTree now allow keyboard navigation, try use arrow keys and enter (coding/WebIDE-Frontend#10)
• Enhance Tab label to show terminal working directory and a dot-indicator of unsaved file state (coding/WebIDE-Frontend#11)
• Add breadcrumb to show path of currently focused tab (coding/WebIDE-Frontend#12)