Ignore user-defined grep aliases
Sometimes users prefer . instead of source

So only check for file name
Check before sourcing, no longer need to remove
Merge branch 'mjwhitta-master'
[install] Join line numbers when multiple matches found
[uninstall] Remove both patterns of source command (#97)

- `[ -f ~/.fzf.${shell} ] && source ~/.fzf.${shell}"`
- `source ~/.fzf.${shell}"`