0.6.1

• Add Neil small aperture scan
• Add method to perform systematic deprojection (IGQU)
• Add App for differential pointing
• Fix bug in dealing with leap second correction.
• Allow python 3.5 & 3.6 (both code and Travis fixed)
• Allow image in interactive ipython to be shown
• Completely remove weave - never used in practice (use fortran instead for speed-up)