adding license + some filename cleanup
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..05769c7
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,35 @@
+pyelftools is in the public domain (see below if you need more details).
+
+pyelftools uses the construct library for structured parsing of a binary
+stream. construct is packaged in pyelftools/construct - it is version 2.00 of
+the library, slighly modified by me. This version was also released by the
+original author of construct into the public domain, and its distribution with
+pyelftools maintains this license.
+
+-------------------------------------------------------------------------------
+
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>
+
diff --git a/README.rst b/README
similarity index 100%
rename from README.rst
rename to README
diff --git a/elftools/common/utils.py b/elftools/common/utils.py
index 7aa1cd9..e0a4cfe 100644
--- a/elftools/common/utils.py
+++ b/elftools/common/utils.py
@@ -6,6 +6,7 @@
 # Eli Bendersky (eliben@gmail.com)
 # This code is in the public domain
 #-------------------------------------------------------------------------------
+from contextlib import contextmanager
 from .exceptions import ELFParseError, ELFError, DWARFError
 from ..construct import ConstructError
 
@@ -71,13 +72,6 @@
     _assert_with_exception(cond, msg, DWARFError)
 
 
-def _assert_with_exception(cond, msg, exception_type):
-    if not cond:
-        raise exception_type(msg)
-
-
-from contextlib import contextmanager
-
 @contextmanager
 def preserve_stream_pos(stream):
     """ Usage:
@@ -91,3 +85,10 @@
     yield
     stream.seek(saved_pos)
 
+
+#------------------------- PRIVATE -------------------------
+
+def _assert_with_exception(cond, msg, exception_type):
+    if not cond:
+        raise exception_type(msg)
+