update README & .gitignore re. configure > compile

- update .gitignore to remove all auto-generated files from git
- update README to include a bit more info about getting dfu-prog
- up and running on debian linux
- remove trailing whitespaces
- last and first were swiched on diff debug info
- grammar error in README
- remove config.h.in - autogenerated file
integrate changes from slarge svn