Remove unused imports throughout project

Unused imports were discovered using flake8. By removing the unused
imports, the code is a bit friendlier to new contributors as it is
clearer what is being used and not simply leftover from previous
refactoring.

The flake8 command:

$ flake8 . --select F401

http://flake8.pycqa.org/

1 files changed, 4 insertions, 5 deletions

diff --git a/examples/verilogParse.py b/examples/verilogParse.py
index 0c63f19..9477e38 100644
--- a/examples/verilogParse.py
+++ b/examples/verilogParse.py
@@ -61,17 +61,16 @@
 #           for udpInstance.

 #   1.0.11 - Fixed bug in inst_args, content alternatives were reversed

 #

-import pdb

 import time

 import pprint

 import sys

 

 __version__ = "1.0.11"

 

-from pyparsing import Literal, CaselessLiteral, Keyword, Word, OneOrMore, ZeroOrMore, \

-        Forward, NotAny, delimitedList, Group, Optional, Combine, alphas, nums, restOfLine, cStyleComment, \

-        alphanums, printables, dblQuotedString, empty, ParseException, ParseResults, MatchFirst, oneOf, GoToColumn, \

-        ParseResults,StringEnd, FollowedBy, ParserElement, And, Regex, cppStyleComment#,__version__

+from pyparsing import Literal, Keyword, Word, OneOrMore, ZeroOrMore, \

+        Forward, delimitedList, Group, Optional, Combine, alphas, nums, restOfLine, \

+        alphanums, dblQuotedString, empty, ParseException, oneOf, \

+        StringEnd, FollowedBy, ParserElement, Regex, cppStyleComment

 import pyparsing

 usePackrat = False

 usePsyco = False