Disable alchemist by default, add Travis build, and document configure option in README

.travis.yml

@@ -68,6 +68,8 @@ matrix:
       env: myCC='clang' EXTRA_DEPS='pkg-config libncursesw5-dev' CONFIGURE_ARGS='--disable-other-drivers --enable-opencl --enable-keccak --enable-scrypt'
     - compiler: ": OpenCL w/o ADL or sensors"
       env: myCC='clang' EXTRA_DEPS='pkg-config libncursesw5-dev' CONFIGURE_ARGS='--disable-other-drivers --enable-opencl --enable-keccak --enable-scrypt --disable-adl'
+    - compiler: ": Only alchemist"
+      env: myCC='clang' EXTRA_DEPS='pkg-config libncursesw5-dev' CONFIGURE_ARGS='--disable-other-drivers --enable-scrypt --enable-alchemist'
     - compiler: ": Only bitforce"
       env: myCC='clang' UBUNTU_DEPS='linux-libc-dev' EXTRA_DEPS='pkg-config libncursesw5-dev' CONFIGURE_ARGS='--disable-other-drivers --enable-bitforce'
     - compiler: ": Only icarus"

README

@@ -142,6 +142,7 @@ BFGMiner driver configuration options:
 	--enable-broad-udevrules
 	                        Include udev rules for ambiguous devices which may
 	                        not be miners
+	--enable-alchemist      Compile support for AlcheMist (default disabled)
 	--disable-avalon        Compile support for Avalon (default enabled)
 	--disable-avalonmm      Compile support for Avalon2/3 (default enabled)
 	--enable-bfsb           Compile support for BFSB (default disabled)

configure.ac

@@ -553,7 +553,7 @@ else
 	adl="no"
 fi
 
-BFG_DRIVER(,AlcheMist,scrypt,auto,[
+BFG_DRIVER(,AlcheMist,scrypt,no,[
 	need_lowl_vcom=yes
 	has_asic=yes
 ])