Use OrderedDict from future.

That's less code we need to maintain...
add starting sequence number support for MiniSEED files
add sequence_number as optional argument of writeMSEED
Removing SEGY benchmarking functionality.
Remove remaining references to internal OrderedDict.
Add CSS format export of Inventories.
Add fuller documentation for CSS station export.
Test CSS station export with comments also.
Merge pull request #910 from QuLogic/css-station

Add CSS format export of Inventories.
Adds missing OrderedDict imports.
changelog
Changelog
Merge pull request #912 from krischer/segy_benchmark_removal

Remove SEGY benchmarking functionality
Merge pull request #911 from QuLogic/future-ordered-dict

Use OrderedDict from future.
Merge pull request #894 from sfieux/mseed_add_seqcount

Add support to MiniSEED sequence count
Changelog for the MiniSEED sequence number writing PR.