gersion bump to reflect bundled libssh2 change

refs: alexcrichton#187
refs: alexcrichton#191

gersion bump to reflect bundled libssh2 change

refs: alexcrichton#187
refs: alexcrichton#191

tag it!

tagging 0.8.0

tagging libssh2-sys-0.2.15

tag 0.7.1

Bump libssh2-sys to 0.2.14

tagging 0.6.0