support special characters in %MSYS_HOME%

Characters like '(' ')' can be recognized as operators in batch, which will result in errors. e.g. msysgit is installed in "../Program Files (x86)/.."
remove quotation marks in output

use "set/p" instead of "echo" to print sentences which contain operators.
character of *backspace* helps to print 4 spaces in front of the content.
remove quotation marks in output(1)

(forget to remove code for testing)
Merge pull request #1 from yqt/master

support special characters in %MSYS_HOME%