Add script to build serialport

Created interactive script to build serialport for node-webkit. This
script can be used after ```npm install``` is run.
nom install builds serialport

Running npm install will result in serialport being rebuilt correctly.
Merge remote-tracking branch 'upstream/master'
Put the build_serialport script in a better location.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Delete build_serialport.sh

Make the main directory cleaner.
Update README to include the build script
Wrap README to 80 characters
Fix README again

This commit message is very nondescript.
Wrap the README to 80 characters and and add information about the
build script.
Merge pull request #173 from docprofsky/build_script

Add Build script for Node-webkit serialport