updated gitignore with qt-specific entries
Update readme.md

added libfftw3 as prerequisite to build on linux
Update readme.md

added notice for qt5-sdk under linux
Update readme.md
added build/ to gitignore
Merge branch 'master' of github.com:semaph0r/LISA
Merge pull request #44 from semaph0r/master

update README and .gitignore