Merge pull request #13 from ivalkeen/master

Fix property name for `max_line_length` in README
Support insert_final_newline property by using PreserveNoEOL.

Closes editorconfig/editorconfig#151
Also search the "Program Files (x86)" directory to automatically detect editorconfig.exe
Fix trailing whitespace trimming

Apply the trailing whitespace setting to all buffers it is relevant to,
not just the last opened one.