Aes format ticks are not formatted properly

[schloerke]

current:

aes(short = 1, veryveryverylong = 2)
# Aesthetic mapping: 
# * `short           ` -> 1
# * `veryveryverylong` -> 2

PR

aes(short = 1, veryveryverylong = 2)
# Aesthetic mapping: 
# * `short`            -> 1
# * `veryveryverylong` -> 2

The back ticks should not contain the white space around the variable names. This change keeps the spacing, just moves the back ticks to be directly around the name.

[schloerke]

Travis is failing on release and devel because of travis downloading issues, not code issues. I believe libraries are being updated.

[hadley]

Thanks!

[lock]

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