tweaks to README

README.md

-# EdosL0Util (BETA)
-Tools for mangling EDOS L0 PDS files.
+# EdosL0Util
+Tools for mangling EDOS L0 PDS files. This package was primarily written to
+support work with EDOS L0 PDS files but can more generically be considered a
+CCSDS packet file manipulation toolkit.
 
 ### Features:
 
 * API for streaming packets
 * CLI tools for:
     - merging multiple PDS files
-    - splitting pds into X minute files
+    - splitting PDS into X minute files
     - truncating files to specified time range
     - inspecting PDS info
 * Dumping JPSS H5 RDRs to L0 PDS files for VIIRS, CrIS, and ATMS
+* Supports both Python 2 & 3
+* Etc ...
 
 There is also support for creating a packet stream from Aqua L0 PDS files, but
-it has not been tested much. Most functionallity assumes EDOS L0 PDS files.
+it has not been tested much. Most functionality assumes EDOS L0 PDS files.
 
 
 ### Packet streaming
@@ -20,7 +24,7 @@ To obtain a simple stream of packets, with support for secondary header
 parsing use the ``PacketStream`` class as an iterator.
 
     >>> from edosl0util.stream import PacketStream
-    >>> stream = PacketStream(open('P1570826VIIRSSCIENCEAS15286023813501.PDS'))
+    >>> stream = PacketStream(open('P1570826VIIRSSCIENCEAS15286023813501.PDS', 'rb'))
     >>> stream.next()
         <Packet apid=826 seqid=13072 stamp=2015-10-13 00:22:04.042798>
     >>> packets = list(stream)
@@ -89,20 +93,20 @@ The ``rdr2l0`` tool will dump out an RDR in an order not suitable for use as a
 NASA L0 PDS file. To generate a L0 PDS file actually requires 2 steps:
 ```
 $> rdr2l0 --diary --skipfill RNSCA-RVIRS_npp_d20151018_t2359214_e0000467_b20595_c20151019015559980487_noaa_ops.h5
-$> edosl0merge -o out.pds RNSCA-RVIRS_npp_d20151018_t2359214_e0000467_b20595_c20151019015559980487_noaa_ops.h5.science.pds
+$> edosl0merge -o out.PDS RNSCA-RVIRS_npp_d20151018_t2359214_e0000467_b20595_c20151019015559980487_noaa_ops.h5.science.PDS
 ```
-The resulting file ``out.pds`` will have packets sorted by time and apid with
+The resulting file ``out.PDS`` will have packets sorted by time and APID with
 any duplicates removed.
 
-The typical case would be to dump multiple RDR files to pds then merge the 
+The typical case would be to dump multiple RDR files to PDS then merge the 
 resulting PDS files into a 6 minute granule like so:
 ```
 $> rdr2l0 --diary --skipfill RNSCA-RVIRS_npp_d20151018_t000*.h5
-$> edosl0merge -o out.pds --trunc_to "2015-10-18 00:00:00,2015-10-18 00:06:00" *.science.pds 
+$> edosl0merge -o out.PDS --trunc_to "2015-10-18 00:00:00,2015-10-18 00:06:00" *.science.PDS 
 ```
 Which will create a proper 6 minute NASA L0 PDS file with any fill packets
 filtered out.
 
 
-If you have quesions or comments related to this software contac
+If you have quesions or comments related to this software contact
 brucef@ssec.wisc.edu.