Added command line arguments to console demo

Example:

consoledemo.exe -i readme.md -o readme.docx

This enables faster testing as command line args can be passed in
with the debugging system

Signed-off-by: mirhagk <mirhagk@gmail.com>
Added some help to build project (required library)
Added style generator for headers 1 - 7
Update readme to point to Open XML SDK 2.5
Switched heading parsing to add headers of any size

headers of size >7 don't have specials styles defined for them
Merge pull request #7 from mirhagk/master

Added multiple header styles, command line args