Make tests run with namespace structure

Make subunit search for tests in the namespace, to avoid the error of
attempting to import relatively beyond top level package. Also, use
relative import in tests.

.testr.conf

@@ -1,4 +1,4 @@
 [DEFAULT]
-test_command=${PYTHON:-python} -m subunit.run discover libindic/spellchecker $LISTOPT $IDOPTION
+test_command=${PYTHON:-python} -m subunit.run discover libindic $LISTOPT $IDOPTION
 test_id_option=--load-list $IDFILE
 test_list_option=--list

libindic/spellchecker/tests/tests_spellchecker.py

@@ -3,16 +3,17 @@
 
 import collections
 
-from libindic import spellchecker
 from libindic.stemmer import Malayalam as stemmer
 from testtools import TestCase
 
+from .. import Malayalam as spellchecker
+
 
 class MalayalamSpellcheckerTest(TestCase):
 
     def setUp(self):
         super(MalayalamSpellcheckerTest, self).setUp()
-        self.spellchecker = spellchecker.Malayalam()
+        self.spellchecker = spellchecker()
         self.stemmer = stemmer()
         self.verbosity = False