Fix missing imports

.gitignore

@@ -13,3 +13,4 @@ setup.py
 *.egg-info
 last_params
 last_params.yml
+.idea

dstat_interface/analysis.py

@@ -21,11 +21,15 @@
 Functions for analyzing data.
 """
 import logging
+import datetime as dt
+import cStringIO as StringIO
+import re
 
 import pygtk
 import gtk
 import numpy as np
 import pandas as pd
+import arrow
 
 logger = logging.getLogger('dstat.analysis')