v0.15.0

• Fix scrolling performance on Mac (#51)
• Improve forward search after loading document (#75)
• Fix reloading of a corrupt pdf file (#37)
• Fix exception on forward search from TeXiFy (#57)
• Fix the color inversion (#10)
• Open links in external browser (#38)
• Fix problems with the page count and add some shortcuts for next/previous page and zoom (#67, #68)
• Improve the experience of having multiple PDFs open (#55, #56, #59, #64)