Remove samples/ directory from source distribution to prevent downloading all pdf's when installing pdfminer.six (#364)

Fixes #363 

* Remove samples/ and docs/ from source distribution. The samples/ dictionairy contains pdf's for testing purposes and the docs/ contain readthedocs documentation and is published online.

* Remove issue-00152-embedded-pdf.pdf because it contains a possible exploit.

See https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Exploit%3AJS%2FShellCode.gen
And https://github.com/pdfminer/pdfminer.six/issues/363

* Added line to CHANGELOG.md

* Remove unused imports

CHANGELOG.md

@@ -5,7 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
-Nothing
+### Security
+- Removed samples/issue-00152-embedded-pdf.pdf because it contains a possible security thread; a javascript enabled object ([#364](https://github.com/pdfminer/pdfminer.six/pull/364))
 
 ## [20200121] - 2020-01-21
 

MANIFEST.in

@@ -4,8 +4,8 @@ include *.txt
 include *.md
 include *.py
 graft cmaprsrc
-graft docs
 graft pdfminer
-graft samples
 graft tools
 global-exclude *.pyc
+prune samples
+prune docs

tests/test_tools_dumppdf.py

@@ -1,5 +1,4 @@
-from shutil import rmtree
+from tempfile import NamedTemporaryFile
-from tempfile import NamedTemporaryFile, mkdtemp
 
 from helpers import absolute_sample_path
 from tools import dumppdf
@@ -37,15 +36,3 @@ class TestDumpPDF():
 
     def test_6(self):
         run('nonfree/naacl06-shinyama.pdf', '-t -a')
-
-    def test_embedded_font_filename(self):
-        """If UF font file name does not exist, then F should be used
-
-        Related issue: https://github.com/pdfminer/pdfminer.six/issues/152
-        """
-        output_dir = mkdtemp()
-        try:
-            run('contrib/issue-00152-embedded-pdf.pdf',
-                '--extract-embedded %s' % output_dir)
-        finally:
-            rmtree(output_dir)