Merge pull request #84 from topcircler/master

change anno duplicate error message.
Handle anno duplicate error
Merge pull request #85 from usersource/master

sync this branch with master
draw elements improvements

1. callout ear postion
2. callout resize control
3. arrow head postion
draw elements improvements

fix z-index issue
callout ear first-time animation
Merge pull request #86 from topcircler/master

1. add anno_webapp project; 2. use ip address for ec2 reverse-proxy
Merge pull request #87 from topcircler/master

add dev configuration
Merge pull request #88 from usersource/draw-elements-improvements

Draw elements improvements
updates -1

1. nav menu changes
2. app name list screen changes
sync with master branch
nav menu changes

1. Put the nav on the bottom of the screen and, similar to Draw menu,
separate it, with no overlay, from the screenshot.
2. Make the Discussion page open from the bottom-up instead of the
top-down
fix ear out of callout box bug
sync with draw elements improvements branch
bug fixes

1. adjust callout one-line-height.
2. fixed the issue that user have to tap twice to show the soft
keyboard.
3. fixed the issue that menu items are hard to tap
sync with draw-elements-improvements branch
Merge pull request #89 from usersource/draw-elements-improvements

Draw elements improvements
Merge pull request #90 from usersource/standardize-menus

Standardize menus
fix sever-url.json
Merge pull request #91 from usersource/standardize-menus

fix sever-url.json
modify intro page2