Include compiled cmap resources to simplify installation for CJK languages

[orangain]

Although this PR will increase package size from 4.0MB to 7.4MB, I think 3.4MB does not matter today; simplifying installation step is more important for newcomers.

Changes

• Run make cmap and git add pdfminer/cmap.
• Modify MANIFEST.in not to include cmaprsrc dir in the sdist package.
• Add pdfminer/cmap/README.txt to include license in the sdist package.
• Remove installation guide specific to CJK languages from README.md.

Package Size

Before: 4.0MB

$ python setup.py -q sdist --formats=gztar,zip
warning: no files found matching '*.txt'
warning: sdist: standard file not found: should have one of README, README.rst, README.txt

$ ll dist/
total 16344
-rw-r--r--  1 orange  wheel  4166269 12 27 12:18 pdfminer.six-20150601.tar.gz
-rw-r--r--  1 orange  wheel  4198099 12 27 12:18 pdfminer.six-20150601.zip

After: 7.4MB

$ python setup.py -q sdist --formats=gztar,zip
warning: sdist: standard file not found: should have one of README, README.rst, README.txt

$ ll dist/
total 30152
-rw-r--r--  1 orange  staff  7631040 12 27 13:05 pdfminer.six-20150601.tar.gz
-rw-r--r--  1 orange  staff  7801523 12 27 13:05 pdfminer.six-20150601.zip

[landscape-bot]

Repository health decreased by 0.72% when pulling f1d5d68 on orangain:include-cmap into 72b2bc3 on goulu:master.

• 10 new problems were found (including 8 errors and 2 code smells).
• 3 problems were fixed (including 0 errors and 3 code smells).