Arrange project structure

[takuyaa]

Purpose

This PR arranges directory structure to simplify build process and project itself.

Changes

Before:

dist/        -- Released objects
  browser/   -- JavaScript file for browser (Browserified)
    kuromoji.js
  dict/      -- Dictionaries for tokenizer (gzipped)
  node/      -- JavaScript file for Node.js

After:

build/        -- JavaScript file for browser (Browserified)
  kuromoji.js
dict/         -- Dictionaries for tokenizer (gzipped)
src/          -- JavaScript file for Node.js

BREAKING CHANGE

• dict dir path is changed from dist/dict/ to dict/
• browserified file path is changed from dist/browser/kuromoji.js to build/kuromoji.js

[coveralls]

Coverage increased (+2.9%) to 93.75% when pulling 96f30c7 on arrange-project-structure into 9437a52 on master.

[codecov-io]

Current coverage is 93.82% (diff: 100%)

Merging #13 into master will increase coverage by 2.92%

@@             master        #13   diff @@
==========================================
  Files            22         22          
  Lines           923        923          
  Methods         120        120          
  Messages          0          0          
  Branches        106        106          
==========================================
+ Hits            839        866    +27   
+ Misses           84         57    -27   
  Partials          0          0          

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