Added default lt 1 to all styles
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Update README.md
  Update README.md
  Update README.md
  Update README.md
Added png examples
Revert "Added default lt 1 to all styles"

This reverts commit 399b604dfe2e13b72ac052a3ea7dd163a7b2e5a9.
Merge pull request #4 from Gnuplotting/png_examples

Png examples