Fix ocrPage.sh pdftoppm error on OS X 10.9
Detect monochrome images and extract them as PBM (1 bpp)
Merge branch 'for-upstream/pdftoppm-error' into for-upstream/mono
Monkeypatch reportlab to output grayscale and monochrome colorspaces
Fix pdffonts error when filename contains a space
parallel version added in RELEASE_NOTES
exit if bad parallel/tesseract version installed
Merge branch 'v2.x' of https://github.com/fritz-hh/OCRmyPDF into v2.x
Merge pull request #48 from jbarlow83/for-upstream/osx-errors

Fix pdffonts error when filename contains a space
poppler syntax (rather than xpdf syntax)
check if python libs are installed

Check if reportlab and lxml are installed, otherwise exist with an error
avoid spurious error msg if no image in pdf
remove spurious space in img number

Tell the script that "nbImg" is a number, so that leading/trailing
spaces are removed
minor changes (comments)
Resolved conflits with jbarlow83 pull request