Updated MainActivity.java
Change the file so the application now do not appending message when the
send button is pressed.
Updated MainActivity.java
Added comments for the onClick listener of showExpression button.
Merge pull request #3 from DandanWang/showExpress_comment

Updated MainActivity.java
Added fragment_face.xml
For displaying face images.
Rename /res/drawable/face7.png to face6.png
Renames res/drawable/face8.png to face7.png
Updated fragment_face.xml
Changed face7.png to face6.png and face8.png to face7.png.
Updated fragment_main.xml
Added a id for the outer LinearLayout
Updated fragment_main.xml
Have the send button display with proper width in landscape orientation.
Updated MainActivity.java
Removed previous function (display a random image) of the send button.
Added a function to send button to show/hide a fragment showing
face*.png.
Updated fragment_face.xml
Changed the height of horizontalScrollView to match_content.
Merge branch 'testing'