v0.6.9

ApproxFunBase v0.6.9

Diff since v0.6.8

Merged pull requests:

• implicit type-params in Fun-related functions (#156) (@jishnub)
• use libblastrampoline instead of libblas/liblapack (#157) (@jishnub)
• Reduce Meta.parse calls (#158) (@jishnub)
• Type asesrtions in BandedMatrix conversion (#159) (@jishnub)