compress app.js

[ruoru]

this app.js is too large, we should compress the app.js. issue #356

before:

Hash: e4c7771ccd16292f68b3
Version: webpack 1.12.9
Time: 15935ms
                         Asset     Size  Chunks             Chunk Names
    images/views/navbar/bg.png   7.6 kB          [emitted]
images/views/member/people.svg  2.73 kB          [emitted]
                        app.js   3.9 MB       0  [emitted]  app.js
                login/index.js  1.24 MB       1  [emitted]  login/index.js
               signup/index.js  1.22 MB       2  [emitted]  signup/index.js
    + 1129 hidden modules

after:

Hash: 5509d91b2cca205b3288
Version: webpack 1.12.9
Time: 36053ms
                         Asset     Size  Chunks             Chunk Names
images/views/member/people.svg  2.73 kB          [emitted]
    images/views/navbar/bg.png   7.6 kB          [emitted]
                        app.js  1.47 MB       0  [emitted]  app.js
                login/index.js   443 kB       1  [emitted]  login/index.js
               signup/index.js   436 kB       2  [emitted]  signup/index.js
    + 1129 hidden modules

result:
but there are some warnings, and there are solve functions.

WARNING in app.js from UglifyJs
Condition always true [./~/fbjs/lib/invariant.js:26,0]
Condition always true [./~/fbjs/lib/warning.js:25,0]
Condition always true [./~/classnames/index.js:40,2]
Dropping unreachable code [./~/classnames/index.js:46,0]
Condition always true [./~/@weflex/weflex-ui/lib/framework.js:27,0]
Condition always true [./~/react/lib/ReactMount.js:119,0]
Condition always true [./~/react/lib/ReactMount.js:197,0]
Condition always true [./~/react/lib/ReactMount.js:259,0]
Condition always true [./~/react/lib/ReactMount.js:53,0]
Condition always true [./~/react/lib/ReactMount.js:371,0]
Condition always true [./~/react/lib/ReactMount.js:431,0]
Condition always true [./~/react/lib/ReactMount.js:447,0]
Condition always true [./~/react/lib/ReactMount.js:467,0]
Condition always true [./~/react/lib/ReactMount.js:478,0]
... ...