Fix for issue #688

Added a fix for issue #688 in which a header has a spurious empty
trailing column that doesn't appear in the following rows.  If a header
is present and the final header column has zero length, the next row is
checked.  If it has one less column than the header, the extra empty
header column is treated as spurious and removed.  Otherwise, the column
is retained.  Two added tests: one for the case where the empty trailing
header column is spurious and should be ignored, and one case where it
is legitimate and should not be ignored.
Updates to fix for issue #688

Added logic to look ahead at the second line and cache it when it
exists.  This eliminates the need for a new reader.  Changed the test
for the empty trailing header to use String.IsNullOrWhiteSpace instead
of checking for zero length.  Also eliminate the update to separators
since a new reader is no longer created.
Updated logo

Updated logo to match new F# Software Foundation logo for F#.  See
composition guidelines for logos at
http://fsharp.org/foundation/logo.html for details
Workaround for #697
Fix UT after Html merge
Definite fix for #697
Merge pull request #690 from mjsottile/master

Fix for issue #688
Update RELEASE_NOTES.md
Update RELEASE_NOTES.md
Use latest paket.targets
Call restore instead of install
Merge pull request #701 from forki/master

Use latest paket.targets
Merge pull request #694 from ReedCopsey/master

Updated logo
Html Fixes

* Make sure all toLower/toUpper are using invariant
* Add missing toLower calls and remove extra not needed toLower calls
* Small tweaks to docstrings
* Replace br's with newline in InnerText
* Fix for #703
Don't add extra spaces in InnerText
Table fixes

* Fix parsing of non-self-closing tags of elements that can't have children when followed by comments
* Remove more layout tables
* Remove junk from column names
* Replace multiple consecutive whitespace characters with just one space like the browser does
* Replace <br> with newline in Text elements
* Don't trim text elements
* Don't add extra spaces between elements
* Improve pretty printing
Merge pull request #704 from ovatsus/master

Html Fixes [Work in Progress]
Fix UT (line endings issue)
More tests
Fix empty columns being inferred as float in HtmlProvider