Convert calibre modules to ebook_converter.

Here is the first batch of modules, which are needed for converting
several formats to LRF. Some of the logic has been change, more cleanups
will follow.

ebook_converter/ebooks/conversion/plugins/tcr_output.py

@@ -7,7 +7,7 @@ __docformat__ = 'restructuredtext en'
 
 import os
 
-from calibre.customize.conversion import OutputFormatPlugin, \
+from ebook_converter.customize.conversion import OutputFormatPlugin, \
     OptionRecommendation
 
 
@@ -25,8 +25,8 @@ class TCROutput(OutputFormatPlugin):
             'The default is utf-8.'))}
 
     def convert(self, oeb_book, output_path, input_plugin, opts, log):
-        from calibre.ebooks.txt.txtml import TXTMLizer
-        from calibre.ebooks.compression.tcr import compress
+        from ebook_converter.ebooks.txt.txtml import TXTMLizer
+        from ebook_converter.ebooks.compression.tcr import compress
 
         close = False
         if not hasattr(output_path, 'write'):