import of jspecview ebuild

Finally the jspecview ebuild. If imported it would be nice to have a tarball for the svn repo. My connection seems to be unreliable with
```
# svn list svn://svn.code.sf.net/p/jspecview/svn/dev2
svn: E210002: Unable to connect to a repository at URL 'svn://svn.code.sf.net/p/jspecview/svn/dev2'
svn: E210002: Network connection closed unexpectedly
```
Evenually there is a connection, but this will actually cause the ebuild to fail.