pdfminer compatibility for #30

I reverse-engineered the latest version of pdfminer so that we can work
with PDFs programatically.

extractor_research/extractors/miner.py

@@ -0,0 +1,33 @@
+#!/usr/bin/python
+from pdfminer.layout import LAParams
+from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
+from pdfminer.converter import TextConverter
+from pdfminer.pdfpage import PDFPage
+
+class Miner:
+    def __init__(self, pdf_file, txt_file, layout_analysis=True):
+        self.pdf_file = file(pdf_file, 'rb')
+        self.outfp = file(txt_file, 'w')
+
+        if layout_analysis:
+            laparams = LAParams()
+        else:
+            laparams = None
+
+        self.rsrcmgr = PDFResourceManager(caching=True)
+        self.device = TextConverter(self.rsrcmgr, self.outfp, codec='utf-8', 
+            laparams=laparams, imagewriter=None)
+
+    def extract(self):
+        interpreter = PDFPageInterpreter(self.rsrcmgr, self.device)
+        pagenos = set()
+        for page in PDFPage.get_pages(self.pdf_file, pagenos, maxpages=0, 
+            password=None, caching=True, check_extractable=True):
+            interpreter.process_page(page)
+        self.pdf_file.close()
+        self.device.close()
+        self.outfp.close()
+
+if __name__ == '__main__': 
+    miner = Miner('../input/pride_and_prej/1.pdf', '../output/pride_and_prej/miner/1.txt')
+    miner.extract()