update README.md for drone.io badges
update grunt default task

run all unit tests as qunit.html in browser
fix mistake exposure of local var
update reture value of SCC, for further unit test

reture an array with two items
the first is the number of components
the second is the top 100 big components size array
update package.json for private package
fix issue #18, unit test by reading files

add test files in compressed file
add FORMAT.md for format specification of input and output
add unit tests through reading file
update grunt task
update npm test script
update decompressing command option in test script

keep old input file if there is a file with same name
this is for big input test (see issue #18 comments)
update output format of SCC unit test

update return value of SCC
update excepted value of unit test
update format specification
update issue #8

fix zero issue in __labelAll__
use numeric label in topological search
use numeric label in graph search

-1 for init
0 for being in frotiner
1 for being visited
update label in topological search

-1 for init
0 for head
>0 for order
update label in tarjan SCC

-1 as init
0 as being SCC
>0 as dfs(v)