add test for toStr16
add toStr2 without gmp
break backword compatibility ; don't add 0x at default
string test for a string having space
Merge branch 'master' into refactor_io
separate hasIO ; add test of io
add toStr test
Merge branch 'refactor_io', remote-tracking branch 'origin'
Merge branch 'master' of github.com:herumi/mie
align for loop