Bash-Completion Errors

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I've installed this dotfiles-repo on a newly installed Yosemite Machine. I also ran brew.sh after installing homebrew. Everything works as expected, but not in the terminal.

After reboot each terminal starts with lots of errors:

```
-bash: declare: -A: invalid option
declare: usage: declare [-afFirtx] [-p] [name[=value] ...]
-bash: complete: -D: invalid option
complete: usage: complete [-abcdefgjksuv] [-pr] [-o option] [-A action] [-G globpat] [-W wordlist] [-P prefix] [-S suffix] [-X filterpat] [-F function] [-C command] [name ...]
```

Also, when i want to use bash completion, something like this happens:

```
mv Dropb-bash: ${prev,,}: bad substitution
```

I typed "mv Dropb" and pressed the Tab-key then. The other characters "-bash: $(prev..." occur then and restricts me to use the bash completion as it was possible before installing these dotfiles.

which part of the dotfiles should i change (or delete) to fix these issues?

Start by inspecting the dotfiles' terminal startup and Bash-completion setup, including the brew.sh changes, then reproduce the errors in a fresh Yosemite terminal. Check the installed Bash and completion configuration against the commands shown in the report. Done means new terminals start without errors and Tab completion works normally.

Written by the indexing model from the issue text.