v1.5.15

• Add python 3.5.3, remove python 3.5.1
  (https://www.pivotaltracker.com/story/show/137773317)
• Add python 3.4.6, remove python 3.4.4
  (https://www.pivotaltracker.com/story/show/137773317)
• Update default python version to 2.7.13
  (https://www.pivotaltracker.com/story/show/136306637)

Packaged binaries:

name	version	cf_stacks
python	2.7.12	cflinuxfs2
python	2.7.13	cflinuxfs2
python	3.3.5	cflinuxfs2
python	3.3.6	cflinuxfs2
python	3.4.5	cflinuxfs2
python	3.4.6	cflinuxfs2
python	3.5.2	cflinuxfs2
python	3.5.3	cflinuxfs2
python	3.6.0	cflinuxfs2
libffi	3.2.1	cflinuxfs2
libmemcache	1.0.18	cflinuxfs2

Default binary versions:

name	version
python	2.7.13

• SHA256: 74160a38f55f0502a30c5780636bea0e154293431dea6c43125147de619ceb5d