Open terminal on current file's directory with ctrl-shift-t.
Open a terminal in the project's root directory with alt-shift-t.
Keybindings: ctrl-shift-t, alt-shift-t
Install: apm install atom-terminal
Config:
"atom-terminal":
# only necessary if standard config doesn't find terminal app
app: "/path/to/your/favorite/terminal"
args: "--useThisOptionWhenLaunchingTerminal"