Invalid let syntax on 0.7

[JobJob]

On today's julia 0.7, using Lazy throws the error:

The form `Expr(:let, ex, binds...)` is deprecated. Use `Expr(:let, Expr(:block, binds...), ex)` instead.
ERROR: LoadError: LoadError: syntax: invalid let syntax
Stacktrace:
 [1] include_relative(::Module, ::String) at ./loading.jl:526
 [2] include at ./sysimg.jl:14 [inlined]
 [3] include(::String) at /Users/job/.julia/v0.7/Lazy/src/Lazy.jl:3
 [4] include_relative(::Module, ::String) at ./loading.jl:526
 [5] include(::Module, ::String) at ./sysimg.jl:14
 [6] anonymous at ./<missing>:2
in expression starting at /Users/job/.julia/v0.7/Lazy/src/liblazy.jl:149
in expression starting at /Users/job/.julia/v0.7/Lazy/src/Lazy.jl:105
ERROR: Failed to precompile Lazy to /Users/job/.julia/lib/v0.7/Lazy.ji.

Changing these lines to ex = Expr(:let, Expr(:block, bindings...), body) fixes it for 0.7, but breaks it for 0.6

No time to get a PR working for all versions right now (plus there are probably other places to change), but thought I'd post here so someone can run with it.

[micahjsmith]

Does anybody have plans to fix this 0.7 compat issue?