Weave.jl v0.5.0

• Drop support for Julia 0.5
• Improved Unicode support for md2pdf. Uses minted-package for syntax highlighting and xelatex
• Use JLD2 for cache instead of JLD
• Use compact output for "text/plain"
• Bug fixes
  • Fix Jupyter notebook version in output
  • Script reader supports empty doc chunks (delimit code, and control output, compatible with Hydrogen)
  • Fix term=true for "rich" mime outputs (html, tex).
  • Fix bug with wrapped output in md2html