Added creation of an admin skeleton and expanding it.

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Fixed Email's send() signature
Merge pull request #579 from SCIF/1.7/develop

Fixed Email's send() signature
add docs for new Arr::merge_assoc() method

Accompanies fuel/core#1508
documented how to get raw error from a ValidationFailed exception
Merge pull request #580 from propcom/feature-array-merge-assoc

add docs for new Arr::merge_assoc() method
documented the use of the "response.redirect_with_wildcards" config key
Merge pull request #578 from samuelsmal/patch-1

Added creation of an admin skeleton and expanding it.
added a link to admin scaffolding
fixed incorrect path() documentation. Closes #574
updated the recommendations, closed #546
replaced all instances of Wether by Whether. closes #564
documented passing an environment to oil on Windows. closes #562
documented email getters
documented installing template engines using composer. closes #70
documented Arr::reindex()