new: preload module logo on focus-out event of the #logoLink input
new: allow modules of type 'project' to define and show a logo picture
change: enhance logo placeholder for broken picture links

And add HTML to generate those placeholder images: I design the image in
the HTML file plus CSS rules and when it's ok, I import it as a PNG,
i.e. I do a screenshot ;)
new: try to update module logo when the logo link validation is ok

Previously, the logo update was only on 'focusout'.
new: flag logo link input field with a warning if logo URL is broken
fix: validate the 2nd password field also when the 1st is modified
new: show success, warning or error icon in inputs with validation
change: more precise hint if the 2nd password field is still blank
new: highlight the whole row for inputs with validation within tables

Now, if an input with validation is within a table, the whole row will
be highlighted in red ('.danger') if the input is not valid
('.has-error'), or in yellow ('.warning') if the input has a warning
('.has-warning').

If the validation is ok ('.has-success') the row is not highlighted.
change: remove specific hard-coded checks of creation and save forms

They are not needed anymore since now there are 'requirements' which are
automatically checked before sending the form.
fix: do not show 'Creation date' row in summary of 'New User' page

NB: This was already ok for module creation pages.
typo: replace 'image' with 'logo file' to avoid confusion

Since 'image' is used accross the SlipStream to refer to cloud images,
it may be confusing to use 'image' to refer to 'pictures'.
new: run tags can be saved by pressing enter key

Please note that the previous behaviour of saving the tags on 'focusout'
is not honored anymore because it is not explicit. However, entering
tags but not saving them by pressing the enter key will flag the page as
'dirty' so that the user will be asked to confirm before leaving the
page.
change: node reference image link not open in new page in view mode