Merge pull request #2680 from andrioni/master

RFC: Add option to use a different handler on Base.test

c98962f8215466b84a9fc3a02e675ea87cf7f8e6@julia
Portuguese documentation should now work without the /en/latest

a2deb5d4aa0345a8e2dd74127c41a6bb18132f61@julia
Document ccall calling convention specifiers

88b67e9ed589aaf77041bc44e7fcc3be34c7a4fb@julia
Make special matrices part of matrix factorizations in the manual
Add Clang.jl in the calling C++ section

206db4de22edd5be50f05659bb061fbcd98091a9@julia
separate indirect calls and calling convention sections

a571701911408d47e2f147f9dff99c461153a328@julia
Updates first few sections of the manual

Mainly affects the two sections about primitive numbers and elementary operations.

[x] Adds videos from MIT tutorial to Getting Started
[x] Consolidates and tabulates primitive types, operators and elementary functions rather than having them in list form
[x] Adds sections about overflow behavior of integers and signed zero float values
[x] Expands documentation for eps
[x] Documents `\` and `^` operators
[x] Minor formatting changes and spelling and grammatical corrections.

JuliaLang/julia@016823a8eaee8521067bf2554312beb32daa4bf4
More updates to front section of manual

JuliaLang/julia@256724deb46e60a459cf6c75550a40f379c4d30f
Yet more refactoring of manual

JuliaLang/julia@921d5157e6884049d8a1bcfb836d10fe47431d59
remove a period