Fixes #106. Also fixed bug in write_data where offset wasn't used copy data from source buffer.
Fixes #106. Also fixed bug in write_data where offset wasn't used copy data from source buffer.

sedge/filer,filerjs/filer,humphd/filer,filerjs/filer,humphd/filer,btulchinsky/idbfs,btulchinsky/idbfs,sedge/filer