Imprement LoggerStub.remove() in pyecell

removeLogger() method is implemented in ecell/pyecell/ecell/_ecs.cpp.
Up to now, delete() method has been implemented in ecell/pyecell/ecell/LoggerStub.py, but "self.theSimulator().deleteLogger( self.theFullPNString ) " is invalid because deleteLogger() is not implemented in _ecs.cpp.
I change the method's name delete() to remove() according to libecs, in which a method's name "removeLogger()" is already used.
LoggerStub.delete() remains as a duplicate of LoggerStub.remove().

These changes work as following on ubuntu12.04:

$ ecell3-session -f simple.eml
ecell3-session [ E-Cell SE Version 3.2.3pre2, on Python Version 2.7.3 ]
Copyright (C) 1996-2012 Keio University.
Copyright (C) 2005-2009 The Molecular Sciences Institute.
More info: http://www.e-cell.org/software
<simple.eml, t=0>>> S = createLoggerStub("Variable:/:S:Value")
<simple.eml, t=0>>> S.create()
<simple.eml, t=0>>> getLoggerList()
['Variable:/:S:Value']
<simple.eml, t=0>>> S.getData()
array([[       0.,  1000000.]])
<simple.eml, t=0>>> run(10)
<simple.eml, t=10>>> S.getData()
array([[  0.00000000e+00,   1.00000000e+06],
       [  1.00000000e-03,   9.99993759e+05],
       [  2.00000000e-03,   9.99987517e+05],
       ..., 
       [  9.99900000e+00,   9.39499867e+05],
       [  1.00000000e+01,   9.39494004e+05],
       [  1.00000000e+01,   9.39494004e+05]])
<simple.eml, t=10>>> S.remove()
<simple.eml, t=10>>> getLoggerList()
[]
<simple.eml, t=10>>> S.getData()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/ecell/LoggerStub.py", line 95, in getData
    aStartTime = self.getStartTime()
  File "/usr/local/lib/python2.7/dist-packages/ecell/LoggerStub.py", line 118, in getStartTime
    return self.theSimulator().getLoggerStartTime( self.theFullPNString )
RuntimeError: NotFound: logger [Variable:/:S:Value] not found
<simple.eml, t=10>>> S.create()
<simple.eml, t=10>>> run(10)
<simple.eml, t=20>>> S.getData()
array([[  1.00000000e+01,   9.39494004e+05],
       [  1.00010000e+01,   9.39488140e+05],
       [  1.00020000e+01,   9.39482276e+05],
       ..., 
       [  1.99980000e+01,   8.82660001e+05],
       [  1.99990000e+01,   8.82654492e+05],
       [  2.00000000e+01,   8.82648983e+05]])
<simple.eml, t=20>>>