changes the client side to round the unix time to avoid floats

alters the time to match the client time zone on the server side

This reverts commit 2b066997d1.

File API gives timestamp in milliseconds, not seconds, so this converts
it correctly.

Ref T609

Ref T609

Ref T609

This moves file operations inside the `for` loop into an anonymous func,
so the `defer` calls don't wait until the end of the handler call to
actually execute.

Ref T609

- Only retrieve a collection from database if an alias is submitted
- Only call GetCollection() once (previously, it was inside the loop)
- Return error if user doesn't own the collection

Ref T609

- Changes Import link location in dropdown menu
- Makes design consistent with Invite People page (and extracts some
  common CSS into core.less)
- Selects the user's first blog by default in the dropdown
- Changes the copy a bit

Ref T609

now checking for and returning invalid content type errors

this updates to parse the time from the imported file, using v0.1.1 of
the wfimport library

in favor of library side generation to support zip files

this changes the import handler to use CreatePost instead of
CreateOwnedPost which required generation of non expiring access tokens

different template action for partial or complete import success

this adds basic support for importing files as blog posts.

.txt and .md are supported at this time and the
collection is selectable, defaulting to draft.

if a collection is specified the post is federated.